**THIS PLUGIN IS NO LONGER MAINTAINED.** But if you wish to use it, I can help you update it to work with the latest version of IntelliJ. See https://github.com/codebling/CommunityCase/issues/26 . This plugin adds support for ClearCase version control system in IntelliJ IDEA Community Edition (and Ultimate Edition - it's faster than the built-in plugin!).
"Changes" window -> "Log" tab: cleartool.exe lsh --max-count=5 --all -- . cleartool: Error: Unrecognized option "--max-count=5"