«For a long time, I've had a hack in my local elisp directory that let me easily visit related files in my perl projects [...] Now that I've started programming more frequently in other languages, I've missed having this feature. Instead of hacking something together for every other language I might use, I decided to generalize the concept of a "project" and "related files". The result is eproject.el ...» -- Eproject is Free Software released under the GPL License.