The OWASP ZAP core project
SoapUI is a free and open source cross-platform functional testing
Programmer-friendly testing framework for Java and the JVM
Now continued as OculiX — see oculix.org
Test automation made simple
Flexible, lightweight multi-language test reporting tool
Most popular Mocking framework for unit tests written in Java
SoloPi Automated Testing Tool
Android unit testing framework
Coverage-guided, in-process fuzzing for the JVM
State of the art mutation testing system for the JVM
API automation and load testing framework
The Open Source Test Automation Platform
Gateway service providing dynamic routing, monitoring and more
A web application for testing webservices
Database Subsetter and Relational Data Browser
Editor for Fixed Width, Csv and Existing Xml files.
Java GUI-Less browser, supporting JavaScript, to run against web pages
Automated tests with databases: prep, verify, restore tables
Enterprise integration testing framework
The Interactive Exernal Accessor Tool for develop, test and support.
A Java Utility Class To Create Combinations of Existing Arrays.
Simple example of draw and rotate 3D box