With the "Rational ClearCase SCM Adapter" IBM offers an integration of ClearCase into Eclipse. The SCM adapter covers all important areas for working with ClearCase and Eclipse.
A little-known command of the ClearCase command line interface (CLI) is the "cleartool annotate" command. With this command the user can create an annotate listing of a version that shows who created which lines in which version. A prerequisite is that the ClearCase element has either element type "text_file" or "compressed_text_file", or that the ClearCase element has an element type that is derived from one of these element types.
The annotated listing is very useful in many situations, but because of the sole availability of this functionality through the CLI it is rarely used. The Annotate Add-On for the IBM Rational ClearCase SCM Adapter integrates the annotate functionality of cleartool into Eclipse. It offers a fast and convenient access to the annotate functionality, which is otherwise only available on the command line.
The Show Annotation operation can simply be invoked from the team context menu. You can find more information under the task Invoke the Show Annotation Operation.