http://itch.io/jam/the-public-domain-jam-2
This is the longest jam I've been in although I don't really have a lot of time or energy to take better advantage of that fact. Still, it's been fun and a nice motivator as well as being an excuse to read a load of public domain stories that I otherwise wouldn't have encountered. Overall, I'd call that a win.
Play it here: http://stephengurnett.itch.io/werewolves-of-war