SikuliX version 2.0.0+ (2019+)
Programmer-friendly testing framework for Java and the JVM
The OWASP ZAP core project
Testing Kotlin and Java annotation processors, compiler plugins
SoapUI is a free and open source cross-platform functional testing
Flexible, lightweight multi-language test reporting tool
Test automation made simple
Coverage-guided, in-process fuzzing for the JVM
Most popular Mocking framework for unit tests written in Java
State of the art mutation testing system for the JVM
Lightweight service virtualization/ API simulation / API mocking tool
Python version of the Playwright testing and automation library
Gateway service providing dynamic routing, monitoring and more
API automation and load testing framework
Property-based testing for Scala
Powerful, elegant and flexible test framework for Kotlin
Desktop app that helps you craft Gatling load-testing simulations
.NET version of the Playwright testing and automation library
Cucumber for Ruby
The Open Source Test Automation Platform
Modern concurrency tools including agents, futures, promises, etc.
Android unit testing framework
Optimizer for mobile applications
Database Subsetter and Relational Data Browser
Java GUI-Less browser, supporting JavaScript, to run against web pages