A roleplaying game by Samuel Penn (sam@glendale.org.uk)
YAGS is an open source tabletop roleplaying game licensed under the GPL. It is designed to be generic, though with character generation rules specific to each genre in order to better capture setting flavour.
See the 'release' directory for some pre-generated PDFs. The rest of the content is XML format text files which are used to generate the PDFs. Stylesheets are available at http://sourceforge.net/projects/yagsbook/
See http://yags.glendale.org.uk/ for more information on the game.