Right before Demonoid went down, someone uploaded their entire RPG Collection to the site. It was broken down into a number of different torrent. These are the torrent files from that collection.
The collection is far from complete in a number of cases but since Demonoid is no longer with us, this may be the only way to get some of this material.
This torrent contains RPGs starting with the letter K. It contains the following systems:
Kids, Castles & Caves
Kobolds Ate My Baby
Kindred of the East (WoD)