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

A fast dependency injector for Android and Java.

A configuration as code language with rich validation and tooling.

A collection of source code generators for Java.

A fast dependency injector for Android and Java.

Unified Queries for Java

Fluent assertions for Java and Android

Test-driven documentation for RESTful services

Secure and speedy templates for Java and Kotlin.

Building an Application with Spring Boot :: Learn how to build an application with minimal configuration.

Testing tools for javac and annotation processors

Spring Boot and Thymeleaf helpers for working with htmx

How to idiomatically structure a large build with Gradle 8 or Gradle 9

Open source test automation tool for web applications, mobile apps and APIs

Simple JVM Profiler Using StatsD and Other Metrics Backends

IntelliJ IDEA plugin which generates an inner builder class