Free and Open Source, Distributed, RESTful Search Engine

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

Mirror of Apache Kafka

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

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

Hystrix is a latency and fault tolerance library designed to isolate points of access to remote systems, services and 3rd party libraries, stop cascading failure and enable resilience in complex di…

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

High Performance Inter-Thread Messaging Library

Zipkin is a distributed tracing system

The official home of the Presto distributed SQL query engine for big data

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

Logstash - transport and process your logs, events, or other data

Generate diagrams from textual description

jsoup: the Java HTML parser, built for HTML editing, cleaning, scraping, and XSS safety.

A Java API for generating .java source files.

Resilience4j is a fault tolerance library designed for Java8 and functional programming

A damn simple library for building production-ready RESTful web services.

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

A fast dependency injector for Android and Java.

AI + Data, online. https://vespa.ai

configuration library for JVM languages using HOCON files

Apache Pinot - A realtime distributed OLAP datastore

A Java library that models spring dynamics and adds real world physics to your app.

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.

A better compressed bitset in Java: used by Apache Spark, Netflix Atlas, Apache Pinot, Tablesaw, and many others

Java annotation processor to create immutable objects and builders, for records too. Sweep boilerplate code under the rug!

A system for distributing and managing secrets

Simple, high-performance event-driven HTTP client+server for Clojure

Electronic Circuit Simulator in the Browser

ZooKeeper client wrapper and rich ZooKeeper framework