WWW::PkgFind watches Web sites, FTP sites, GIT repositories, etc. for new code releases, and downloads them. In other words, it's like a Web spider tuned for downloading software packages and patches. It is also able to generate a queue of incoming packages, to allow subsequent processing (such as running tests on them).
rvi is a wrapper script which gives you an easy way of integrating RCS with your existing vim/vi work environment. Simply use "rvi filename" instead of "vim filename", and the file will automatically be checked into revision control, and the changes you made after the edit will be displayed each time you finish editing.