| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 2002 | 978-0-9722511-0-5 | Michael J. Varhola · Paul O. Knorr | Experts: A Comprehensive D20 Sourcebook for Fantasy Role-Playing Games |
| 2003 | 978-0-9722511-1-2 | Michael J. Varhola · Paul O. Knorr · Sharon Daugherty · David L. Thomas · Luke Gygax | Warriors: A Comprehensive D20 Sourcebook for Fantasy Role-Playing Games |
| 2004 | 978-0-9722511-2-9 | Paul O. Knorr · Michael J. Varhola · Skirmisher Game Development Group | Tests of Skill: A d20 Adventure and Sourcebook for Fantasy Role-Playing Games |
| 2005 | 978-0-9722511-4-3 | Michael J. Varhola · Sharon Daugherty · Skirmisher Game Development Group | Nuisances: A Comprehensive OGL (d20 System) Sourcebook for Fantasy Role-Playing Games |
| 2004 | 978-0-9722511-5-0 | H.G. Wells · Gary Gygax · Michael J. Varhola · Diane K. Varhola | Little Wars |
| '' | 978-0-9722511-6-7 | Lee Garvin · Skirmisher Game Development Group | Control: The Game of Absolute Corruption (A non-d20 Role-Playing Game) |
| 2006 | 978-0-9722511-7-4 | H.G. Wells · James F. Dunnigan | Floor Games |
| 2005 | 978-0-9722511-9-8 | Michael J. Varhola · Paul O. Knorr · Perry Frix · Skirmisher Game Development Group · Gary Gygax | Experts v.3.5: A Comprehensive OGL Sourcebook For Fantasy Role-Playing Games |