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.
Very old project (last release was 11 years ago).
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.