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