A web forum devoted to making Keen mods, with tools for modding the Keen games:
Andy.durdin.net
A web forum about the Keen games, along with mods and fan-made games:
Pub128.ezboard.com
(disclaimer: the first site is mine, but AFAIK it's the primary source for Keen modding info)
For some reason I couldn't add these sites into ModDB...
adurdin
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