Stars
Free and Open Source, Distributed, RESTful Search Engine
ZXing ("Zebra Crossing") barcode scanning library for Java, Android
GraalVM compiles applications into native executables that start instantly, scale fast, and use fewer compute resources 🚀
Vert.x is a tool-kit for building reactive applications on the JVM
OpenRefine is a free, open source power tool for working with messy data and improving it
Distributed and fault-tolerant realtime computation: stream processing, continuous computation, distributed RPC, and more
OrientDB is the most versatile DBMS supporting Graph, Document, Reactive, Full-Text and Geospatial models in one Multi-Model product. OrientDB can run distributed (Multi-Master), supports SQL, ACID…
Reactive Streams Specification for the JVM
Real-time transport layer for Java AI agents. Build once with @Agent — deliver over WebSocket, SSE, gRPC, and WebTransport/HTTP3. Talk MCP, A2A and AG-UI.
A Graph Traversal Language (no longer active - see Apache TinkerPop)
Hawtio web console helps you manage your JVM stuff and stay cool!
Elegant parsing in Java and Scala - lightweight, easy-to-use, powerful.
Py4J enables Python programs to dynamically access arbitrary Java objects
Enterprise-Grade Open-Source Network Management Platform
T.J. Watson Libraries for Analysis, with front ends for Java, Android, and JavaScript, and many common static program analyses.
Scheduler (HTTP API and webapp) for running Mesos tasks—long running processes, one-off tasks, and scheduled jobs. #hubspot-open-source
The Java microservice lib. QBit is a reactive programming lib for building microservices - JSON, HTTP, WebSocket, and REST. QBit uses reactive programming to build elastic REST, and WebSockets base…
The master repository for the Spacewalk Project.