P. M. · Paola Mastrantonio · Paola Mastrocola · Paolo Mastrolilli · Paul MacCotter · Paul Mastrangelo · Phil Masters, Elizabeth McCoy with Walter Milliken, Ken Hite
Atlas Games · Guardians of Order · Pegasus Spiele · Steve Jackson Games · White Wolf Publishing
| title | ISBN-13 | year of publica- tion | other author(s) | |
|---|---|---|---|---|
| Dreaming Cities: Tri-Stat Urban Fantasy Genre | 978-1-894938-08-2 | 2005 | Jason Blair · Jamais Cascio · Jo Ramsay · Elizabeth Rich | |
| GURPS Banestorm | 978-1-55634-744-3 | 2005 | ||
| GURPS Discworld | 978-1-55634-261-5 | 1998 | Terry Pratchett | |
| GURPS Discworld Also | 978-1-55634-447-3 | 2000 | " | |
| GURPS Dragons | 978-1-55634-599-9 | 2004 | ||
| Gurps Powers, Fourth Edition | 978-1-55634-742-9 | 2005 | Sean Punch | |
| GURPS, Scheibenwelt | 978-3-930635-58-0 | 1999 | Steve Jackson · Terry Pratchett | |
| GURPS Thaumatology | 978-1-55634-758-0 | 2008 | ||
| *OP Artisans Handbook | 978-1-56504-493-7 | 1999 | ||
| *OP Swashbucklers Handbook | 978-1-56504-470-8 | 2000 | Phil Brucato | |
| Personnel Files | 978-1-55634-679-8 | 2002 | ||
| Tales of Mythic Europe | 978-1-58978-110-8 | 2009 | Timothy Ferguson · Mark Lawford · Matt Ryan · Alexander White | |
Phil Masters, Elizabeth McCoy with Walter Milliken, Ken Hite