Free and Open Source, Distributed, RESTful Search Engine

Redisson - Valkey and Redis Java client. Real-Time Data Platform. Sync/Async/RxJava/Reactive API. Over 50 Valkey and Redis based Java objects and services: Set, Multimap, SortedSet, Map, List, Queu…

The Clojure programming language

Apache Cassandra®

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

Android application powering the mirror in my house

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

Runtime code generation for the Java virtual machine.

Distributed Graph Database

A library for working with Bitcoin

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.

Implementation of various string similarity and distance algorithms: Levenshtein, Jaro-winkler, n-Gram, Q-Gram, Jaccard index, Longest Common Subsequence edit distance, cosine similarity ...

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

Stream summarizer and cardinality estimator.

XPrivacy - The ultimate, yet easy to use, privacy manager

A p2p, secure file storage, social network and application protocol

jmxtrans

A Property Graph Model Interface (no longer active - see Apache TinkerPop)

DEPRECATED Java I/O library for Raspberry Pi (GPIO, I2C, SPI, UART)

Simple Java image-scaling library implementing Chris Campbell's incremental scaling algorithm as well as Java2D's "best-practices" image-scaling techniques.

linear time regular expression matching in Java

Snappy compressor/decompressor for Java

An embeddable write-once key-value store written in Java

Library of different Bloom filters in Java with optional Redis-backing, counting and many hashing options.

Lightning Memory Database (LMDB) for Java: a low latency, transactional, sorted, embedded, key-value store

Netflix's distributed Data Pipeline

A JVM-based Erlang VM

Low-overhead, non-blocking I/O, external Process implementation for Java

Bytecode to source converting Java & Kotlin code into JavaScript, C++, D, C#, PHP, AS3, Dart and Haxe and run it everywhere. Also use JVM code in your favourite language as a library.

Fibers and actors for web development