I finally got around to finishing MyTab on Sunday, the group finance web app I'd been promising my housemates for a while.
I'm not exactly sure how to describe it, but it's kinda the equivalent to that sheet of paper on your fridge that you use to share bills around the house. I wrote it mainly for my current house to use, but if other people find it useful, then that's great.
In somewhat of an experiment, it's released under the GNU Affero GPL. Patches welcome, as usual.