OpenClover 4.2 is based on source code of Atlassian Clover® 4.1 and has all its features, so please read the general documentation of Clover 4.1. Differences are described in the OpenClover 4.2 Release Notes. See also Maven site documentation.
A set of articles describing common problems and how to solve them.
The Stackoverflow-like Q&A forum where you can find several hundred questions about Clover there.
It brought support for IntelliJ IDEA 15, Eclipse Mars.1 and introduced new name of Clover Maven Plugin.
It brought completely redesigned HTML report, following the Atlassian Design Guidelines. It has also renamed Clover Core JAR, new database format and no longer supports JKD5.
It added support for the Spock framework and JUnit4's parameterized tests.
It added support for Java 1.8 language constructs, including instrumentation of lambda expressions and virtual extension methods (the "default" methods) in interfaces.
The JIRA issue tracker for Atlassian Clover®. It's a good source to check if a bug you encounter is not reported already and whether there's any workaround available.