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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]
www.koalog.com/

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

FindLaw: Special Coverage
Ongoing collection of legal news and commentary about various business, political and social issue topics in the news.
news.findlaw.com/

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

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

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

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]
www.cenqua.com/

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

Glass Jar Toolkit
Provides branch coverage without source code. Very low overhead, HTML and XML output. [Commercial, free for open source development]
www.testersedge.com/

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