Free and Open Source, Distributed, RESTful Search Engine

Google core libraries for Java

Netty project - an event-driven asynchronous network application framework

GraalVM compiles applications into native executables that start instantly, scale fast, and use fewer compute resources 🚀

ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files.

A high performance caching library for Java

The Java gRPC implementation. HTTP/2 based RPC

Efficient reliable UDP unicast, UDP multicast, and IPC message transport

📈 Capturing JVM- and application-level metrics. So you know what's going on.

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

Example code from Learning Spark book

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…

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

High Performance data structures and utility methods for Java

Compiles Java bytecode to JavaScript, WebAssembly and C

JeroMQ is a pure Java implementation of the ZeroMQ messaging library, offering high-performance asynchronous messaging for distributed or concurrent applications.

pure java git solution

For more info see

JavaCC - a parser generator for building parsers from grammars. It can generate code in Java, C++ and C#.

The fast scanner generator for Java™ with full Unicode support

Obsolete repository. Moved to oracle/graal.

ECMAScript runtime for the JVM

The Ceylon compiler, language module, and command line tools

This is BugVM

Tools for type annotations in Java