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