Recently released a self-hosted Trello alternative called Wheatbin: http://wheatbin.com. It combines Kanban with the Law of the Harvest.
It's 100 percent free, open source and available on Github.
Nice! I did my own clone as well, just containing the 3 boards of todo inprogress & complete. Made it to learn react, and react native (for the mobile version). I mostly use trello now, as they've just managed to make a much stronger web client than I can. I still like my own mobile client better though.
Also the fact their app works completely offline for a while now is rather handy.