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

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

Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.

GraphQL Java implementation

Java implementation of JSON Web Token (JWT)

Joda-Time is the widely used replacement for the Java date and time classes prior to Java SE 8.

Fault tolerance and resilience patterns for the JVM

Generates a unified GraphQL schema from gRPC microservices and other Protobuf sources

Master repository for the JGraphT project

Speedment is a Stream ORM Java Toolkit and Runtime

FitNesse -- The Acceptance Test Wiki

Diff Utils library is an OpenSource library for performing the comparison / diff operations between texts or some kind of data: computing diffs, applying patches, generating unified diffs or parsin…

Structurizr DSL

Secure and speedy templates for Java and Kotlin.

Java library to represent monetary amounts.

Property-Based Testing on the JUnit Platform

Icon packs for Java applications

faked out in-memory mongo for java

Several implementations of a text table, originally using ASCII and UTF-8 characters for borders.

oj! Algorithms

A vector drawing editor for LaTeX (JavaFX).

Java Object-Graph Mapping Library for Neo4j

Generic, Null-safe, Immutable Collections and Functional Transformations for the JVM

VocabHunter helps learners of foreign languages find vital new vocabulary to study.

Concordion is an open source framework for Java that lets you turn a plain English description of a requirement into an automated test. Concordion is the most flexible tool for creating high-qualit…

Clojure's data structures modified for use outside of Clojure

Infer a project's version from your Git repository.

Gradle plugin for generating java source from wsdl files

Functional Reactive Programming (FRP) for JavaFX