Atlassian Clover is described as 'provides Java and Groovy code coverage for software testing. Spend more time writing code that does stuff than code that tests stuff'. There are five alternatives to Atlassian Clover for a variety of platforms, including Mac, Windows, Linux, Eclipse and IntelliJ IDEA. The best alternative is EclEmma, which is both free and Open Source. Other great apps like Atlassian Clover are OpenClover (Free, Open Source), cobertura (Free, Open Source), Coverlipse (Free, Open Source) and CodeCover (Free, Open Source).
OpenClover is a free and open-source code coverage tool for Java, Groovy and AspectJ. It's based on the open-sourced version of Atlassian Clover®, the world's most sophisticated code coverage tool. Attack your top project risks first.
SourceForge presents the Coverlipse project. Coverlipse is an open source application. SourceForge provides the world's largest selection of Open Source Software. An eclipse plugin for code coverage visualization of JUnit Tests. Especially useful for test-first development.
CodeCover is a free glass-box testing tool developed in 2007 at the University of Stuttgart. CodeCover measures statement, branch, loop, term coverage (subsumes MC/DC), question mark operator coverage, and synchronized coverage.