I'm a professional photographer, but as a hobby I do Python programming.
I have my own little projects like an universal automatic updater for Gentoo Linux, or a notes program called WriteUp, but they're more like coding exercises than end-user programs.
Right now I'm working on an open source project management tool called "Supervise" (supervise-django in ohloh website), there's still a long way from being usable, but I think it will become very useful to others.
By the way, I'm a Haiku OS translator (spanish team)