Hansel
- JUnit extension that adds code coverage testing to the framework. [BSDL]
- http://hansel.sourceforge.net/

JavaCov
- A tool which tests Branch/Condition/Decision depth, implemented as an Eclipse plug-in. Its manufacturer Alvicom also offers a tutorial. [Commercial]
- http://www.alvicom.hu/products/JavaCov

jcoverage
- Identifies how many times each line of code in an application has been executed. Commercial support available. [Open source, GPL]
- http://jcoverage.com/

Open Source Code Coverage Tools in Java
- Lists tools with links and a short description.
- http://java-source.net/open-source/code-coverage

Koalog Code Coverage
- Main features are in-process or remote coverage computation, capability of working directly on Java binaries, predefined or custom report generation, session merging, portability, and Ant integration. [Commercial, trial version]
- http://www.koalog.com/php/kover.php

Java Test Coverage Tool
- A tool for collection test coverage on large Java Systems. Works with Java, Realtime Java, and embedded JVMs. [Commercial]
- http://www.semdesigns.com/Products/TestCoverage/JavaTestCoverage.html

Clover
- Measures statement, method, and branch coverage and has XML, HTML, and GUI reporting. and comprehensive plug-ins for major IDEs. [Free for Open Source and non-commercial projects]
- http://www.cenqua.com/clover/

alphaWorks : FoCuS
- Implements the functional coverage methodology, providing detailed coverage information.
- http://www.alphaworks.ibm.com/tech/focus/

EMMA
- Reports on class, method, basic block, and line coverage (text, HTML, and XML). [Open source, Common Public License]
- http://emma.sourceforge.net/