Clover is a Java tool for generating code coverage reports from unit tests. It can be executed as a plugin in Ant, Eclipse, or Maven. It can also use to collect coverage data of integration tests.
1. Open source and free to use tool for Java
2. Very easy to use because of on-the-fly byte code
3. Inline annotation helps to visually highlight statement-level coverage
4. Test optimization feature makes it painless to run testsuite before every check-in
More Information and Official Website:
Download : https://www.atlassian.com/software/clover/download/