Personal lightweight wiki based on DidiWiki. Upgraded to accept text and highlight colours, image resize and video (youtube, dailymotion...) embedded, password to edit pages, private tag... Written in C, it requires less than 1 MBytes of RAM and runs smoothly on Raspberry Pi 2 @ 700MHz (power consumption of 2W).
Example of ciwiki running on Raspberry Pi2 @ 700Mz: http://inphilly.dyn.dhs.org
News on July 2022 : I'm working on the next version of Ciwiki. The version 3.x.y will have the header, footer, login page, error messages stored on files vs hard coded in wikitext.h. This solution will allow the owner to customize the pages without to have to recompile the code.