This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
There are a number of gaming systems which include Apple II software for
creating games. For example, two systems which continue to attract new authors
are Eamon (Text adventures) and Explorer/gs (Ultima-style adventures).
These sites have game creation programs and documentation:
Asimov (and mirrors)- arcade and adventure game makers and
editors are included in game images folders
ftp://ftp.apple.asimov.net/pub/apple_II/images/games/
GraphicsMagician.com- docs, source code, libraries, ... to support
projects using Graphics Magician
http://graphicsmagician.com/
Ground- Eamon, Explorer/gs, and arcade
Eamon authoring programs and adventures at ...
ftp://ground.ecn.uiowa.edu/2/apple2/Eamon/
Explorer/gs authoring program and adventures at ...
ftp://ground.ecn.uiowa.edu/2/apple2/Collections/AOL/Games/Explorer/
Clayburn W. Juniel's arcade program development wares at ...
ftp://ground.ecn.uiowa.edu/apple2/Collections/Clay/
GS WorldView- game authoring programs (in Archive: Utilities)
http://apple2.org.za/gswv/a2zine/Sel/
Inform Page- Interactive fiction Inform interpreter
http://www.inform-fiction.org/
Interactive Fiction Archive- IF interpreters and game authoring
information and contests (multi-platform)
ftp://ftp.gmd.de/if-archive/
TADS Page- Interactive fiction TADS interpreter
http://www.tela.bc.ca/tela/tads/
--Rubywand, Zeprfrew, Charles T. Turley, John Beatty, Netrunner68, Marc Sira,
Swigg, Steve Evans, Jm, Greg Wildman
 
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