RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.

High Performance Inter-Thread Messaging Library

A high performance caching library for Java

Zipkin is a distributed tracing system

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

AWS Service registry for resilient mid-tier load balancing and failover.

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

Distributed and fault-tolerant realtime computation: stream processing, continuous computation, distributed RPC, and more

A fast dependency injector for Android and Java.

Statistical Machine Intelligence & Learning Engine

Apache Pinot - A realtime distributed OLAP datastore

MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.

Reactive Streams Specification for the JVM

Fork of tagtraum industries' GCViewer. Tagtraum stopped development in 2008, I aim to improve support for Sun's / Oracle's java 1.6+ garbage collector logs (including G1 collector)

Fibers, Channels and Actors 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.

Backport of Java 8's lambda expressions to Java 7, 6 and 5

Log analyser / visualiser for Java HotSpot JIT compiler. Inspect inlining decisions, hot methods, bytecode, and assembly. View results in the JavaFX user interface.

A High Dynamic Range (HDR) Histogram

A distributed data integration framework that simplifies common aspects of big data integration such as data ingestion, replication, organization and lifecycle management for both streaming and bat…

Bind a java thread to a given core

Lightweight threads for Java, with message passing, nio, http and scheduling support.

A platform that makes it easy for developers to build realtime, cost-effective, operations-focused applications

Janino is a super-small, super-fast Java™ compiler.

A Java MQTT Client

A sampling JVM profiler without the safepoint sample bias

LZ4 compression for Java

Dead-Simple Packaging and Deployment for JVM Apps

BTC + BitHub = An experiment in funding privacy OSS.