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