un_chapeau is a server for the Mastodon protocol, implemented in Django.
It's currently some way from being useable.
For what's left to do, please see the TODO list.
See also the Mastodon API reference.
In case anyone's wondering, the default avatar was taken from the cover of an issue of the German art noveau magazine Jugend, painted in 1914 by Paul Rieth.
GNU AGPL.