Uncovering Cicada Wiki

Link: http://uncovering-cicada.wikia.com/

It is a mess, but it exists. Almost everything is documentet on it, but

#cicadasolvers on freenode

Link: http://webchat.freenode.net/?channels=cicadasolvers

IRC chat.

Max Bernstein's Cicada 3301 page

Link: http://bernsteinbear.com/blog/cicada

A page on Max Bernstein's blog.

clevcode.org/cicada-3301

Link: http://www.clevcode.org/cicada-3301/

on Github

Bibanon

Link: https://github.com/bibanon/bibanon/wiki/Cicada-3301-wiki

Michel Oosterhof

Links: https://github.com/micheloosterhof/cicada-2014 and https://github.com/micheloosterhof/cicada-2016

A good repo.

rtkd/idkfa

Link: https://github.com/rtkd/idkfa

Another good repo.