i wrote up a quick gui for the standard sauer server, in c++ and qt4, i currently only have windows binaries, but will upload linux ones, and will also upload the source sometime, this isnt an ingame gui, nor is it just a program to configure the server, all functions it has are used while the server is running, when you run the "Sauerbraten Server.exe" after you run the extractor, the server is started, and ready for you to connect to ingame.
some of the features of the gui include
-change mastermode
-change server info such as the description, password, max clients, port, etc.
-change map/mode
-kick players
-show player stats
-force intermission
-Clear Bans
*** UPDATE 1 ***
-Force map button that opens a new dialog that allows you to sellect map by name, select mode, and also displays a screenshot of the map
-server output console
-ability to send a message to the server
-dynamically updated player list that shows the players stats
i will be doing a lot more work on it, and i am also open to ideas, so any ideas or complaints/bugs you may have, just let me know