Jon F. Zeigler

• GURPS Sid Meier's Alpha Centauri
• GURPS Space
• GURPS Space Fourth Edition (GURPS: Generic Universal Role Playing System)
• GURPS Traveller
• GURPS Traveller Nobles
• GURPS Traveller Rim of Fire
• Transhuman Space Fifth Wave (Transhuman Space)
• GURPS Greece