Querki actually started out, somewhere around 2003, because of a LARP. I was building a game, and knew that I wanted to do it online -- even then, it was already clear that collaborating with my friends was going to be easier if it was online. I started out trying to do it with a Wiki system, but quickly got frustrated because Wikis don't have much structure -- they're just a bunch of pages. I wanted to be able to define concepts like "Character" and "Plot", relate them to each other, do queries in that data, and so on.
So I took the Wiki system, hacked it for a week or two, and wound up with something I called ProWiki. (Short for "Wiki with Properties".) I used that to build my game, and several more after it, but was never completely happy with it -- while ProWiki worked, it was hard to use, hard to install and just not very stable. And then it turned out that there already was something named ProWiki, and they weren't very happy about my stepping on their name.
So around 2005, I started drafting ideas for what ProWiki should be -- how to make it easier to use, more broadly useful and just plain more interesting. I named that "Querki" -- short for "Queryable Wiki" -- and put it on the back burner until 2012, when I finally decided to take the project seriously. I've been working on Querki full-time since then, and the result is what you're using here.