QStat is a command-line program that displays information about
Internet game servers. The servers are either down, non-responsive, or
running a game. For servers running a game, the server name, map name,
current number of players, and response time are displayed. Server
rules and player information may also be displayed.

Version 2.2b supports the following games:
old Quake (NetQuake)
QuakeWorld
Hexen II
HexenWorld
Quake II
Unreal
Turok2
Sin
Half-Life  

Distfile: qstat22b.tar.gz (110kb) 
Author: Steve Jankowski <steve@activesw.com>
WWW: http://www.activesw.com/people/steve/qstat.html