Quake III Player finder allows you to find players based on a list of server IP's in serverlist.txt. It is written in VB.NET and provided under the GPLv3 license.

Features
- Get the player's score and ping
- Get the server's name, map and max clients
- Much faster than obtaining a list from the master server when you can narrow the search down
- Ability to connect to the server from the client
Extract the zip and edit the serverlist.txt file.
Sites like GameTracker are good for finding the IP:Port of the server you would like to search.
Finally, launch the executable.
http://code.google.com/p/quake3-playerfinder/