4GEM Central: A few links, small amount of interesting information.
Artline: Free downloads of GEM Artline (and Artline 2), first worldwide full-featured illustration application for IBM PCs. Released in 1988, it had full Bézier support, fully scaleable vector-fonts, PostScript support.
Atari TOS History: Revision history of Atari TOS and GEM.
Digital Research's GEM: Intel 8086 version: PC-GEM fine descriptions, downloads.
FreeGEM WebRing: Sites that promote use and development of PC/GEM: can be anything from gaming to programming.
GEM: PC GEM and GEM documentation, downloads, links, news, screenshots, developer information.
GEM Programs: Heinz Rath's page: downloads (desktop, drivers, games; binaries, source), documentation, links.
GEM Workshop: Part of the large Owen Rudge site: downloads (GEM Download Manager for Windows, drivers), links, history, information, screenshots.
Intel GEM: Graphical environment for IBM PC and Atari ST. PC GEM was a fairly widely used GUI until the release of Windows 3.0. Now licensed under the GPL.
MAD - My Atari Derived Library: Article. Casting GEMs before PC-users.
Shane Land OpenGEM: The online home of Shane Martin Coughlan. Downloads the OpenGEM distribution of GEM. Also author's projects, presonal info., C.V., photos, blog.
Yahoo Groups: gem-announce: Announcement list for GEM and the FreeGEM project.