#1 PDF Application on GitHub that lets you edit PDFs on any device anywhere

Free and Open Source, Distributed, RESTful Search Engine

Ghidra is a software reverse engineering (SRE) framework

Free universal database tool and SQL client

Dex to Java decompiler

Open Source Identity and Access Management For Modern Applications and Services

Apache Kafka - A distributed event streaming platform

Browse media content with your own rules on Android TV

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

Jenkins automation server

A tool for reverse engineering Android apk files

QuestDB is a high performance, open-source, time-series database

Apache Hadoop

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

The ZAP by Checkmarx Core project

Open source alternative to Auth0 / Firebase Auth / AWS Cognito

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

Vert.x is a tool-kit for building reactive applications on the JVM

Arduino IDE 1.x

🔎 Open source distributed and RESTful search engine.

Generate diagrams from textual description

Open-Source Web UI for Apache Kafka Management

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

Free and open log management

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

Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API

Hazelcast is a unified real-time data platform combining stream processing with a fast data store, allowing customers to act instantly on data-in-motion for real-time insights.

Apache NiFi

Lightweight Java and Android library for integration with Ethereum clients

Yahoo! Cloud Serving Benchmark