The Eclipe Eiffel Development Tools (EDT) are a set of plugins which implement a full-fledged, highly integrated Eiffel development environment based on the Eclipse Platform. The EDT plugins contribute a number of facilities specific to Eiffel, such as an Eiffel builder, a Cluster Explorer, and Refactorings.
codemetre allows you to compare different versions of your software project, determining how and how much source files have changed. It currently recognizes both source code and comments from Ada, Bash shell, C, Eiffel, SQL, and more. It can also provide you with metrics on any single snapshot of your project.