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Personnal or familly wiki with low ressource requirement.
Personal lightweight wiki based on DidiWiki. Upgraded to accept text and highlight color, image resize and video (youtube, dailymotion...) embedded. Written in C, doesn't require a lot of RAM. Works fine on Raspbian (Raspberry Pi).
Example of Ciwiki running on Raspberry Pi B+ (700MHz, 512MB):
http://inphilly.dyn.dhs.org
Hatta is a wiki engine that uses a Mercurial repository for storing the pages. You can run it as a web application on your server, or locally on your computer. You can also do both, and synchronize the repositories once in a while.