@b0rk I think it was #drupal, or #joomla before that.
I also built a rather unwieldy thing on top of #wikka wiki, which seemed like a good idea at the time.
And #pico, for which I extended multilingual support.
I later tried to rebuild an existing site in #Jekyll but it did not turn out well with user acceptance.
This was all volunteering for NGOs.
All of these (and a #MAMP installation) and tinkering let me learn how the systems were out together and how to adjust them for my needs.