Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.
It is a great solution for communities and companies wanting to privately host their own chat service or for developers looking forward to build and evolve their own chat platforms.
PostgreSQL Database Modeler is an open source data modeling tool designed for PostgreSQL. No more DDL commands written by hand let pgModeler do the job for you! This software reunites the concepts of entity-relationship diagrams and the features that PostgreSQL implements as extensions of SQL standards.
Jitsi is a set of open-source projects that allows you to easily build and deploy secure videoconferencing solutions. At the heart of Jitsi are Jitsi Videobridge and Jitsi Meet, which let you have conferences on the internet, while other projects in the community enable other features such as audio, dial-in, recording, and simulcasting.
Eclipse Che is a developer workspace server and cloud IDE built for teams and organizations.
Cadence is a distributed, scalable, durable, and highly available orchestration engine we developed at Uber Engineering to execute asynchronous long-running business logic in a scalable and resilient way.
Kitchen provides a test harness to execute infrastructure code on one or more platforms in isolation.
A driver plugin architecture is used to run code on various cloud providers and virtualization technologies such as Vagrant, Amazon EC2, and Docker. Read more
Many testing frameworks are supported out of the box including InSpec, Serverspec, and Bats
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 copied from the browser's network inspector with the "copy as cURL" feature.
A tool for managing JavaScript projects with multiple packages.
ORY Hydra is the most popular OAuth 2.0 and OpenID Connect server. It integrates with every identity management and meets or exceeds security best practices.
ORY Oathkeeper is a reverse proxy which checks whether requests to your APIs should be allowed or not. No more adding isAllowed() everywhere in your code.
ORY Keto solves complex permission systems (multi-tenant, attribute-based access control, ...) with access control policies (IAM Policies).
The ORY Security Console connects with your existing ORY Hydra and ORY Oathkeeper isntallation and lets you manage and monitor them through an intuitive UI.
Twill is an open source Laravel package that helps developers rapidly create a custom CMS that is beautiful, powerful, and flexible. By standardizing common functions without compromising developer control, Twill makes it easy to deliver a feature-rich admin console that focuses on modern publishing needs.
Polly.JS is a standalone, framework-agnostic JavaScript library that enables recording, replaying, and stubbing HTTP interactions.
Polly taps into native browser APIs to mock requests and responses with little to no configuration while giving you the ability to take full control of each request with a simple, powerful, and intuitive API.
Free multi-platform database tool for developers, SQL programmers, database administrators and analysts. Supports all popular databases: MySQL, PostgreSQL, MariaDB, SQLite, Oracle, DB2, SQL Server, Sybase, MS Access, Teradata, Firebird, Derby, etc.
pg_chameleon is a MySQL to PostgreSQL replica system written in Python 3. The tool can connect to the mysql replication protocol and replicate the data changes in PostgreSQL. Whether the user needs to setup a permanent replica between MySQL and PostgreSQL or perform an engine migration, pg_chamaleon is the perfect tool for the job.
pgloader loads data into PostgreSQL and allows you to implement Continuous Migration from your current database to PostgreSQL.
pgLoader has two modes of operation. It can either load data from files, such as CSV or Fixed-File Format; or migrate a whole database to PostgreSQL.
pgLoader supports several RDBMS solutions as a migration source, and fetches information from the catalog tables over a connection to then create an equivalent schema in PostgreSQL. This means that you can migrate to PostgreSQL in a single command-line!
Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.
RSSify some content sources:
Email: get your favorite newsletters or any other types of emails straight to your RSS reader.
Telegram channel: free your Telegram chat list from channels and read them via RSS instead.
HTTP webhook (for tech-savvy people): send HTTP requests to Notifier and read them via RSS. 
RoadRunner is an open source (MIT licensed), high-performance PSR-7 PHP application server, load balancer and process manager. It supports service model with ability to extend it's functionality on a project basis.
Lambda functions simplified.
.arc is a plaintext manifest for defining next generation cloud infrastructure.
Version control your architecture and create cloud infra in minutes from an .arc manifest
Deploy in seconds with first class support for staging and production
Work locally while completely offline with a speedy in-memory database
Primitives not Frameworks; define app architecture agnostic of vendor arcana
Orchestrate and leverage powerful Amazon Web Services cloud primitives without frustrating configuration.
Sonar is a platform for debugging mobile apps on iOS and Android. Visualize, inspect, and control your apps from a simple desktop interface. Use Sonar as is or extend it using the plugin API.
Vue Native is a framework to build cross platform native mobile apps using JavaScript