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.

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.

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

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.

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.

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.

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.

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.

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

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.

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

A free, online, open source API request builder

A simple HTTP Request & Response Service.

This app uses the API of other websites and gives you an RSS feed in return. Quick and simple.

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.

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.

BlurHash is a compact representation of a placeholder for an image.

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.

A directory of high quality real-time event sources.

Sometimes you just need to put something somewhere and then fetch it later. And sometimes you need to change it without asking for anyone’s permission or keeping track of a token. Volatile is a database that anyone can edit. On the internet.