Free and Open Source, Distributed, RESTful Search Engine

Termux - a terminal emulator application for Android OS extendible by variety of packages.

Netty project - an event-driven asynchronous network application framework

Open Source Identity and Access Management For Modern Applications and Services

Telegram for Android source

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

a fast, scalable, multi-language and extensible build system

Hystrix is a latency and fault tolerance library designed to isolate points of access to remote systems, services and 3rd party libraries, stop cascading failure and enable resilience in complex di…

Zipkin is a distributed tracing system

The official home of the Presto distributed SQL query engine for big data

Logstash - transport and process your logs, events, or other data

Zuul is a gateway service that provides dynamic routing, monitoring, resiliency, security, and more.

Cryptomator for Windows, macOS, and Linux: Secure client-side encryption for your cloud storage, ensuring privacy and control over your data.

APM, (Application Performance Management) tool for large-scale distributed systems.

The Java gRPC implementation. HTTP/2 based RPC

Free implementation of Play Services

Server supporting the Signal Private Messenger applications on Android, Desktop, and iOS

Continuous Inspection

Spinnaker is an open source, multi-cloud continuous delivery platform for releasing software changes with high velocity and confidence.

Tools for keeping your cloud operating in top form. Chaos Monkey is a resiliency tool that helps applications tolerate random instance failures.

Free and open log management

Enso Analytics is a self-service data prep and analysis platform designed for data teams.

Tutorials for using RabbitMQ in various ways

Open source version of Google Authenticator (except the Android app)

A scalable, distributed Time Series Database.

H2 is an embeddable RDBMS written in Java.

CrateDB is a distributed and scalable SQL database for storing and analyzing massive amounts of data in near real-time, even with complex queries. It is PostgreSQL-compatible, and based on Lucene.

Jitsi is an audio/video and chat communicator that supports protocols such as SIP, XMPP/Jabber, IRC and many other useful features.

signal-cli provides an unofficial commandline, JSON-RPC and dbus interface for the Signal messenger.

SpotBugs is FindBugs' successor. A tool for static analysis to look for bugs in Java code.