The project tag has over a thousand tagged questions, but doesn't seem to do a lot. Looking at the wiki, the description is very vague:
In software development, a project is a collection of files and resources used in the development of an application or service.
The description is fairly unspecific and many of the questions go along the lines of "How to start a project?" Which goes against SO guidelines; having a tag that could suggest these questions are ok would be bad, much like project-idea which was removed.
The tag feels a bit redundant as there are already tags for specific ides like eclipse and netbeans (which many of the questions are already tagged as).
This also goes for projects.