Starsiege Tribes has been released as a free game. There are two main client downloads for you to pick from:
Download Tribes 1 classic
Download Tribes 1 with HD textures
Dedicated Game Servers
Currently I run a pair of old school Starsiege Tribes servers:
For detials on Tribes Aerial Combat (TAC) check out tacmod.com and the TAC1 forum
Dedicated Server Setup details
This old site has the goods on hosting a tribes dedicated server.
I run my game servers in linux. Here is the basic launcher script I am currently using to run Tribes dedicated server in wine:
nohup su -c "cd /srv/tribes; export WINEPREFIX='/srv/tribes/.wine'; \
wine /srv/tribes/Tribes.exe +exec rushworx_tac -mod tac -dedicated" \
-s /bin/sh tribes &
I will some day make an init script or something a little smarter like that.