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81 results tagged api  ✕   ✕
Hurl https://hurl.dev/
08/09/2025 cluster icon
  • mountebank : mountebank is the first open source tool to provide cross-platform, multi-protocol test doubles over the wire. Simply point your application under tes...
  • htty : htty is a console application for interacting with web servers. It’s a fun way to explore web APIs and to learn the ins and outs of HTTP.
  • Webhook Tester : Webhook Tester allows you to easily test webhooks and other types of HTTP requests.
  • HTTPie : HTTPie—aitch-tee-tee-pie—is a command line HTTP client with an intuitive UI, JSON support, syntax highlighting, wget-like downloads, plugins, and more
  • wuzz : Interactive cli tool for HTTP inspection Wuzz command line arguments are similar to cURL's arguments, so it can be used to inspect/modify requests cop...

Hurl is a command line tool that runs HTTP requests defined in a simple plain text format.

It can chain requests, capture values and evaluate queries on headers and body response. Hurl is very versatile: it can be used for both fetching data and testing HTTP sessions.

Hurl makes it easy to work with HTML content, REST / SOAP / GraphQL APIs, or any other XML / JSON based APIs.

cli http test tool api
CLever Audio Plug-In https://cleveraudio.org/
06/07/2025 cluster icon
  • Gibberish : Gibberish is designed to be a fast audio API for the browser. It takes the low-level building blocks provided by genish.js and uses them to create hig...
  • Gibberish : Fast, JavaScript DSP library that creates JIT optimized audio callbacks using code generation techniques. It is designed to be a fast audio API for br...
  • Glicol : make music with code. connect different nodes like a synth, sequencer or sampler.
  • Flagr : Flagr is an open source Go service that delivers the right experience to the right entity and monitors the impact. It provides feature flags, experime...
  • supercollider : SuperCollider is an environment and programming language for real time audio synthesis and algorithmic composition. It provides an interpreted object-...

CLAP stands for CLever Audio Plug-in. It is an audio plug-in ABI which defines a standard for Digital Audio Workstations and audio plug-ins (synthesizers, audio effects, …) to work together.

audio plugin api daw
Gibberish https://github.com/gibber-cc/gibberish
12/04/2025 cluster icon
  • Mood Synthesizer : A synthesizer built with Vue.js and C++ (compiled to WebAssembly). The UI is inspired by Ableton Playground.
  • Gibberish : Fast, JavaScript DSP library that creates JIT optimized audio callbacks using code generation techniques. It is designed to be a fast audio API for br...
  • Soundgrain : Soundgrain is a graphical interface where users can draw and edit trajectories to control granular sound synthesis. Soundgrain is written with Python/...
  • kimono : Turn websites into structured APIs from your browser in seconds
  • Cecilia : Cecilia is an audio signal processing environment aimed at sound designers. Cecilia mangles sound in ways unheard of. Cecilia lets you create your own...

Gibberish is designed to be a fast audio API for the browser. It takes the low-level building blocks provided by genish.js and uses them to create higher-level synthesizers, effects, and sequencers. Gibberish processes each sample of each synthesis block one sample at a time, enabling a variety of effects not typically possible in JavaScript synthesis systems, most importantly single-sample feedback loops and audio-rate modulation of scheduling.

audio api browser synth synthesis
Appwrite https://appwrite.io/
10/12/2024 cluster icon
  • Kinto : Kinto is a lightweight JSON storage service with synchronisation and sharing abilities.
  • Cool QL Cool : CoolQLCool (CQC) is an open source GraphQL server that allows you to turn websites into GraphQL APIs.
  • Prisma : Prisma turns your database into a powerful GraphQL API which you can either use to build your own GraphQL server or connect to it directly from the fr...
  • Supabase : Supabase is an open source Firebase alternative. Create a backend in less than 2 minutes. Start your project with a Postgres Database, Authentication,...
  • WireMock : Free and Open Source tool for building mock APIs. Create stable development environments, isolate yourself from flakey 3rd parties and simulate APIs t...

Appwrite is an end-to-end backend server for Web, Mobile, Native, or Backend apps packaged as a set of Docker microservices. Appwrite abstracts the complexity and repetitiveness required to build a modern backend API from scratch and allows you to build secure apps faster.

Using Appwrite, you can easily integrate your app with user authentication and multiple sign-in methods, a database for storing and querying users and team data, storage and file management, image manipulation, Cloud Functions, and more services.

backend server opensource docker microservice api authentication storage database
Mockoon https://github.com/mockoon/mockoon
06/11/2024 cluster icon
  • WireMock : Free and Open Source tool for building mock APIs. Create stable development environments, isolate yourself from flakey 3rd parties and simulate APIs t...
  • Grafana k6 : Grafana k6 is an open-source, developer-friendly, and extensible load testing tool. k6 allows you to prevent performance issues and proactively improv...
  • Novu : Novu provides a unified API that makes it simple to send notifications through multiple channels, including In-App, Push, Email, SMS, and Chat. With N...
  • mountebank : mountebank is the first open source tool to provide cross-platform, multi-protocol test doubles over the wire. Simply point your application under tes...
  • gRPC : gRPC is a modern, open source remote procedure call (RPC) framework that can run anywhere. It enables client and server applications to communicate tr...

Mockoon is the easiest and quickest way to design and run mock APIs. No remote deployment, no account required, free and open-source.

api testing mock opensource
Novu https://github.com/novuhq/novu
03/09/2023 cluster icon
  • Novu : The open-source notifications infrastructure. A fully-featured microservice to send SMS, E-mail, Slack and Push notifications. Embeddable notification...
  • ntfy : Send push notifications to your phone or desktop using PUT/POST
  • BlurHash : BlurHash is a compact representation of a placeholder for an image.
  • Matrix : Matrix is an open standard for decentralised communication, providing simple HTTP APIs and open source reference implementations for securely distribu...
  • gRPC : gRPC is a modern, open source remote procedure call (RPC) framework that can run anywhere. It enables client and server applications to communicate tr...

Novu provides a unified API that makes it simple to send notifications through multiple channels, including In-App, Push, Email, SMS, and Chat. With Novu, you can create custom workflows and define conditions for each channel, ensuring that your notifications are delivered in the most effective way possible.

notification api service opensource
Val Town https://www.val.town/
14/07/2023 cluster icon
  • StdLib : The Standard Library for Functions as a Service. Discover pre-built APIs, compose your own, build apps, and move your business faster than ever with n...
  • Quicktype : Quicktype generates types and helper code for reading JSON in C#, Swift, JavaScript, Flow, Python, TypeScript, Go, Rust, Objective-C, Kotlin, C++ and ...
  • Weaviate : Weaviate is an open-source vector database that stores both objects and vectors, allowing for the combination of vector search with structured filteri...
  • Prisma : Prisma turns your database into a powerful GraphQL API which you can either use to build your own GraphQL server or connect to it directly from the fr...
  • howdoi : Instant coding answers via the command line.

Val Town is a social website to write and run code. Vals are small JavaScript/TypeScript snippets that run on their servers. You can create APIs, scheduled functions, email yourself, and persist small pieces of data — all from the browser.

code repl cloud lamda functions api
WireMock https://wiremock.org/
28/06/2023 cluster icon
  • Mockoon : Mockoon is the easiest and quickest way to design and run mock APIs. No remote deployment, no account required, free and open-source.
  • Appwrite : Appwrite is an end-to-end backend server for Web, Mobile, Native, or Backend apps packaged as a set of Docker microservices. Appwrite abstracts the co...
  • Postal : Postal is a complete and fully featured mail server for use by websites & web servers. Think Sendgrid, Mailgun or Postmark but open source and ready f...
  • Matrix : Matrix is an open standard for decentralised communication, providing simple HTTP APIs and open source reference implementations for securely distribu...
  • npoint.io : JSON storage bins with schema validation

Free and Open Source tool for building mock APIs. Create stable development environments, isolate yourself from flakey 3rd parties and simulate APIs that don't exist yet.

api mock server opensource
Appsmith https://github.com/appsmithorg/appsmith
01/03/2022 cluster icon
  • Prisma : Prisma turns your database into a powerful GraphQL API which you can either use to build your own GraphQL server or connect to it directly from the fr...
  • Quicktype : Quicktype generates types and helper code for reading JSON in C#, Swift, JavaScript, Flow, Python, TypeScript, Go, Rust, Objective-C, Kotlin, C++ and ...
  • JazzRecord : ActiveRecord for JavaScript (ORM)
  • Appwrite : Appwrite is an end-to-end backend server for Web, Mobile, Native, or Backend apps packaged as a set of Docker microservices. Appwrite abstracts the co...
  • Photon : UI toolkit for building desktop apps with Electron.
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Turn any datasource into an internal app in minutes. Appsmith lets you drag-and-drop UI components to build pages, connect to any API, database or GraphQL source and write logic with JavaScript objects.

graphql ui administration api database javascript
Supabase https://supabase.com/
19/11/2021 cluster icon
  • Appwrite : Appwrite is an end-to-end backend server for Web, Mobile, Native, or Backend apps packaged as a set of Docker microservices. Appwrite abstracts the co...
  • Real time event sources : A directory of high quality real-time event sources.
  • CryptPad : CryptPad is the Zero Knowledge realtime collaborative editor. Encryption carried out in your web browser protects the data from the server, the cloud ...
  • Horizon : RethinkDB Horizon is an open-source developer platform for building realtime, scalable web apps. It is built on top of RethinkDB, and allows app devel...
  • localForage : localForage is a handy library that improves the offline experience of your web app by using asynchronous storage (via IndexedDB or WebSQL where avail...
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Supabase is an open source Firebase alternative. Create a backend in less than 2 minutes. Start your project with a Postgres Database, Authentication, instant APIs, realtime subscriptions and Storage.

postgresql realtime authentication api storage
AI21 Studio https://www.ai21.com/studio
15/08/2021 cluster icon
  • EleutherAI : EleutherAI is a decentralized grassroots collective of volunteer developers, engineers, and researchers focused on AI alignment, scaling, and open sou...
  • Alpaca : Given a web API, Generate client libraries in node, php, python, ruby
  • Wordoid : Wordoids are made-up words. They look unique and sound natural. They are great for naming new things.
  • Tracery : A story-grammar generation library for javascript. Write grammar objects, get generative stories.
  • Gluon API : A clear, concise, simple yet powerful and efficient API for deep learning.

AI21 Studio allows users to generate text completions for an input prompt using Jurassic-1 language models.

api naturallanguage text generator machinelearning
Quicktype https://quicktype.io/
06/06/2021 cluster icon
  • Appsmith : Turn any datasource into an internal app in minutes. Appsmith lets you drag-and-drop UI components to build pages, connect to any API, database or Gra...
  • Data Science Toolkit : A collection of the best open data sets and open-source tools for data science, wrapped in an easy-to-use REST/JSON API with command line, Python and ...
  • Falcor : Falcor is the innovative data platform that powers the Netflix UIs. Falcor allows you to model all your backend data as a single Virtual JSON object o...
  • Cool QL Cool : CoolQLCool (CQC) is an open source GraphQL server that allows you to turn websites into GraphQL APIs.
  • Bottery : Bottery is a syntax, editor, and simulator for prototyping generative contextual conversations modeled as finite state machines.

Quicktype generates types and helper code for reading JSON in C#, Swift, JavaScript, Flow, Python, TypeScript, Go, Rust, Objective-C, Kotlin, C++ and more. Customize online with advanced options, or download a command-line tool.

json graphql code developer api C# swift go javascript python
FastAPI https://fastapi.tiangolo.com/
31/03/2021 cluster icon
  • Eve : Eve is an open source Python REST API framework designed for human beings. It allows to effortlessly build and deploy highly customizable, fully featu...
  • Cliquet : Cliquet is a toolkit to ease the implementation of HTTP microservices, such as data-driven REST APIs.
  • XgeneCloud : XgeneCloud is an API Framework platform that instantly generates REST / GraphQL APIs on any SQL database. Supports MySQL, PostgreSQL, MSSQL, SQLite &...
  • Frisby.js : Frisby is a REST API testing framework built on node.js and Jasmine that makes testing API endpoints easy, fast, and fun. Read below for a quick overv...
  • Data Science Toolkit : A collection of the best open data sets and open-source tools for data science, wrapped in an easy-to-use REST/JSON API with command line, Python and ...

FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.6+ based on standard Python type hints.

python rest api framework
Hoppscotch https://github.com/hoppscotch/hoppscotch
11/01/2021 cluster icon
  • Hurl : Hurl is a command line tool that runs HTTP requests defined in a simple plain text format. It can chain requests, capture values and evaluate queries ...
  • mountebank : mountebank is the first open source tool to provide cross-platform, multi-protocol test doubles over the wire. Simply point your application under tes...
  • htty : htty is a console application for interacting with web servers. It’s a fun way to explore web APIs and to learn the ins and outs of HTTP.
  • httpbin.org : A simple HTTP Request & Response Service.
  • xh : xh is a friendly and fast tool for sending HTTP requests. It reimplements as much as possible of HTTPie's excellent design, with a focus on improved p...
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A free, online, open source API request builder

api web http tool
httpbin.org https://httpbin.org/
01/07/2020 cluster icon
  • Mockbin : Mockbin allows you to generate custom endpoints to test, mock, and track HTTP requests & responses between libraries, sockets and APIs.
  • mountebank : mountebank is the first open source tool to provide cross-platform, multi-protocol test doubles over the wire. Simply point your application under tes...
  • Vcr : Record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests.
  • Smocker : Smocker (server mock) is a simple and efficient HTTP mock server. Smocker exposes a configuration user interface and a configuration api to register n...
  • Webhook Tester : Webhook Tester allows you to easily test webhooks and other types of HTTP requests.

A simple HTTP Request & Response Service.

mock http api test
RSS Box https://github.com/stefansundin/rssbox
23/06/2020 cluster icon
  • Feed43 : Your favorite site doesn't provide news feeds? This free online service converts any web page to an RSS feed on the fly.
  • Buf : A CLI tool to help working with Protocol Buffers. Buf currently contains: A linter that enforces good API design choices and structure. A breaking ch...
  • Feedity : Feedity is an online data extraction tool and RSS feed builder
  • YOURLS : YOURLS stands for Your Own URL Shortener. It is a small set of PHP scripts that will allow you to run your own URL shortening service (a la TinyURL or...
  • Prisma : Prisma turns your database into a powerful GraphQL API which you can either use to build your own GraphQL server or connect to it directly from the fr...
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This app uses the API of other websites and gives you an RSS feed in return. Quick and simple.

rss api tool
Buf https://buf.build/
22/06/2020 cluster icon
  • Hurl : Hurl is a command line tool that runs HTTP requests defined in a simple plain text format. It can chain requests, capture values and evaluate queries ...
  • htty : htty is a console application for interacting with web servers. It’s a fun way to explore web APIs and to learn the ins and outs of HTTP.
  • gulp.js : The streaming build system.
  • chezmoi : Manage your dotfiles across multiple diverse machines, securely.
  • Hadolint : A smarter Dockerfile linter that helps you build best practice Docker images. The linter is parsing the Dockerfile into an AST and performs rules on t...
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A CLI tool to help working with Protocol Buffers.
Buf currently contains:

  • A linter that enforces good API design choices and structure.
  • A breaking change detector that enforces compatibility at the source code or wire level.
  • A configurable file builder that produces Images, our extension of FileDescriptorSets.
api protobuf lint build cli tool
XgeneCloud https://xgenecloud.com/
17/06/2020 cluster icon
  • FastAPI : FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.6+ based on standard Python type hints.
  • Eve : Eve is an open source Python REST API framework designed for human beings. It allows to effortlessly build and deploy highly customizable, fully featu...
  • Frisby.js : Frisby is a REST API testing framework built on node.js and Jasmine that makes testing API endpoints easy, fast, and fun. Read below for a quick overv...
  • GatsbyJS : Gatsby is a modern framework for blazing fast websites, made with React and GraphQL.
  • Iron : Iron is a fast and flexible middleware-oriented server framework that provides a small but robust foundation for creating complex applications and RES...

XgeneCloud is an API Framework platform that instantly generates REST / GraphQL APIs on any SQL database.

  • Supports MySQL, PostgreSQL, MSSQL, SQLite & MariaDb.
  • Comes with a builtin GUI Database Client and API Client.
  • Host generated APIs as Serverless Functions on any Cloud Platform.
api rest graphql framework platform sql serverless
BlurHash https://blurha.sh/
23/04/2020 cluster icon
  • Appwrite : Appwrite is an end-to-end backend server for Web, Mobile, Native, or Backend apps packaged as a set of Docker microservices. Appwrite abstracts the co...
  • Kroki : Convert plain text diagrams to images ! Kroki provides a unified API with support for BlockDiag (BlockDiag, SeqDiag, ActDiag, NwDiag), C4 (with PlantU...
  • Cool QL Cool : CoolQLCool (CQC) is an open source GraphQL server that allows you to turn websites into GraphQL APIs.
  • WireMock : Free and Open Source tool for building mock APIs. Create stable development environments, isolate yourself from flakey 3rd parties and simulate APIs t...
  • Matrix : Matrix is an open standard for decentralised communication, providing simple HTTP APIs and open source reference implementations for securely distribu...
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BlurHash is a compact representation of a placeholder for an image.

image api placeholder opensource
Openframe https://openframe.io/
14/03/2020 cluster icon
  • kimono : Turn websites into structured APIs from your browser in seconds
  • DERI Pipes : Inspired by Yahoo's Pipes, DERI Pipes is an engine and graphical environment for general Web Data transformations and Mashup.
  • OpenCalais : Calais is a rapidly growing toolkit of capabilities that allow you to readily incorporate state-of-the-art semantic functionality within your blog, co...
  • Collage.js : Collage.js brings together many public APIs, along a method of presenting media within a limitless two-dimesional space to create memorable experience...
  • IFTT : Put the internet to work for you.

Openframe is an open source platform for artists, curators and art enthusiasts to share, discover and display digital art.

Openframe is free. Anyone can set up a frame using an HDMI display and a Raspberry Pi.

Openframe is a collaborative, on-going project. The platform consists of an API, a web app, and software for the RPi that currently supports images, video, web-based artwork, and shaders. Our goal is to create a system that is accessible and extensible, allowing artists to easily add support for new digital formats.

art display api web raspberrypi
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