It's pretty amazing to see this project still going. I remember Sauerbraten more because of its unique engine. Maps are basically a big octree with something like marching-cubes applied, and can be edited in realtime (and in multiplayer).
The developers have many notable side projects in the gaming space, too. Aardappel has a programming language, Lobster[0]. And eihrul created the ENet library for UDP networking[1]. I think Sauerbraten itself uses ENet.