User summary:
Net Enhancements for Role-Playing Shadowrun. A series of unofficial community-created supplement for Shadowrun.
NERPS was created on a mailing list, where everything was discussed, and commented on, and delegated to writers, who would then hand it over to an editor, to finish and collect the articles into a whole book.
The books were published in different versions (usually PDF and RTF) and different sizes (usually A4 and Letter), and can be found on many servers on the internet for free.