I installed mercurial on OS X and used command line. It seems simpler than Git so I am okay to operate it without GUI. One thing to note is that you must always pull all the updates, merge, commit and then push the files before you push again your files.
I installed Dokuwiki in Fab Lab Taipei and I will use it for documentation. Though it is so popular as Tikiwiki and Mediawiki, it is very simple in backend structure while many extensions are available. Installing Dokuwiki is easy, but one thing to note is that permission must be set in the web server (apache2 in my case) to disallow violation.
I also tried a tool named ImageMagick for image rescaling on Unix-like system. It is incredibly easy to rescale the size of your photos with one command. I am writing an extension for Dokuwiki to rescale photos uploaded automatically.