The ZAP by Checkmarx Core project

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

A powerful flow control component enabling reliability, resilience and monitoring for microservices. (面向云原生微服务的高可用流控防护组件)

Eclipse Collections is a collections framework for Java with optimized data structures and a rich, functional and fluent API.

OpenGrok is a fast and usable source code search and cross reference engine, written in Java

Free and open log management

🔥 Seata is an easy-to-use, high-performance, open source distributed transaction solution.

Empowering Data Intelligence with Distributed SQL for Sharding, Scalability, and Security Across All Databases.

The Data Transfer Project makes it easy for platforms to build interoperable user data portability features. We are establishing a common framework, including data models and protocols, to enable direct transfer of data both into and out of participating online service providers.

A decentralized bitcoin exchange network

an easy-to-use dynamic service discovery, configuration and service management platform for building AI cloud native applications.

Open source routing engine for OpenStreetMap. Use it as Java library or standalone web server.

Apache Doris is an easy-to-use, high performance and unified analytics database.

🦖 Classic arcade shoot 'em up built with Java & FXGL. Contributions welcome – game & Next.js docs.

The AI search platform

Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.

Event Driven Orchestration & Scheduling Platform for Mission Critical Applications

OpenRefine is a free, open source power tool for working with messy data and improving it

The java implementation of Apache Dubbo. An RPC and microservice framework.

Cruise-control is the first of its kind to fully automate the dynamic workload rebalance and self-healing of a Kafka cluster. It provides great value to Kafka users by simplifying the operation of Kafka clusters.

CQEngine Next - Maintained Fork

OWASP VulnerableApp Project: Break it. Scan it. Reproduce it. Benchmark against it. Improve it.

📲cim(cross IM) 适用于开发者的分布式即时通讯系统

Pluggable type-checking for Java

Free universal database tool and SQL client

The SpotBugs plugin for security audits of Java web applications and Android applications. (Also work with Kotlin, Groovy and Scala projects)

Your go-to microservice framework for any situation, from the creator of Netty et al. You can build any type of microservice leveraging your favorite technologies, including gRPC, Thrift, Kotlin, Retrofit, Reactive Streams, Spring Boot and Dropwizard.

🏗 Build container images for your Java applications.

🔎 Open source distributed and RESTful search engine.

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.

A libre lightweight streaming front-end for Android.

Desktop app for managing BibTeX and BibLaTeX (.bib) libraries

A DLNA, UPnP and HTTP(S) Media Server.

A podcast manager for Android

Free and Open Source, Distributed, RESTful Search Engine

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

Process Orchestration Framework

The Janssen Project is a home for open source IAM components, featuring Auth Server (OAuth/OpenID), Agama low-code identity orchestration, and the Cedarling policy decision point. The "Janssen Server" distributions bundle IAM components under one control plane.

Kafka GUI for Apache Kafka to manage topics, topics data, consumers group, schema registry, connect and more...

Soot - A Java optimization framework

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

An extensible multilanguage static code analyzer.

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.

Terasology - open source voxel world

Eclipse OpenJ9: A Java Virtual Machine for OpenJDK that's optimized for small footprint, fast start-up, and high throughput. Builds on Eclipse OMR (https://github.com/eclipse/omr) and combines with the Extensions for OpenJDK for OpenJ9 repo.

Quarkus: Supersonic Subatomic Java.