Open Source

Codestriker
Perl CGI script which is used for performing code reviews in a collaborative fashion over a Web frontend. [GPL]
http://codestriker.sourceforge.net/

DBMonster
A tool which helps with tuning the structure of a database, its indexes, and testing application performance under heavy database load. It generates random test data and puts it into a SQL database. [Apache Software License]
http://dbmonster.kernelpanic.pl/

DejaGnu
A framework for testing other programs. Its purpose is to provide a single front end for all tests. Think of it as a custom library of Tcl procedures crafted to support writing a test harness. [GPL]
http://www.gnu.org/software/dejagnu/

Fitnesse Acceptance Testing Framework
A simple tool that allows non-technical users to specify and run acceptance tests for software systems.
http://fitnesse.org/

JPdfUnit
A framework for testing a generated PDF document with the JUnit test framework. It is designed for access to the PDFBox library and provides simple ready-to-use assertions for comparing the expected data to the concrete data of a PDF document. [ASL]
http://jpdfunit.sourceforge.net/

Open Source Testing
Features details of Open Source testing tools for functional, performance and security testing, link checking, test management and bug tracking systems.
http://www.opensourcetesting.org/

TestLink
Web based tool supporting test specification, requirements, plans (reporting, assignment, prioritization), test execution and cooperation with several bug tracking systems. Demo site available. [GPL]
http://www.teamst.org/

TestSuite Log Parser and Browser
A tool to store and easily use results of conformance-like testsuites runs throuh a web interface. Can extract statistics or compare several runs very simply. [GPL]
http://tslogparser.sourceforge.net/

Web Test Tools
A project which provides tools for different test methods such as unit tests (JUnit), and different kinds of tests for applications. Additionally an implementation of Internet protocols in Java is available. [GPL and LGPL]
http://wttools.sourceforge.net/