psDooM is a process monitor and manager for *nix systems. It could be considered a graphical interface to the 'ps', 'renice', and 'kill' commands. psDooM is based on XDoom, which is based on id Software's 'Doom'.
q3ctrl is an implementation of the Quake 3 Arena server communication protocol, running as a command line utility. It is handy for sending commands (or command scripts) to your dedicated server, or checking its status. It is also able to query the master servers.
cstat is a tool to gather real-time statistics
from Cube and Cube engine 2 game servers and
output text, ANSI, and XML. Supported games are
Cube, Sauerbraten, AssaultCube, and Blood Frontier.