UnityLobby is a lobby written by hollowsoul in Python. Getting it working right now is a little bit of a pain, but it is your only choice to play spring on linux if you do not wish to use wine.

Steps to install UnityLobby:

1. Install subversion.
2. Install UnityLobby dependencies.
3. Check out spring from the latest version, and Unity lobby from the trunk (https://taspring.clan-sy.com/svn/spring/).
4. Compile unitsync.so and copy it into UnityLobby.
5. Switch directories to the UnityLobby, and run ./Unity.py
6. Have fun!