This is a purely spleef server (with some free-building as well).
To join this server, go to http://www.minecraftforum.net/topic/339068-spleef-server-tournament-hosting-available/

Poundcraft - 24/7 Freebuild Server
http://www.minecraftforum.net/topic/1514767-new-247-poundcraft-putting-the-free-back-in-freebuild-whitelist/

Server with adventure map. Small quests and treasurer to find. Proper quarters for new members with all the convenience for living the first days on this world. Capacity 20 but more to come when I'm moving this to proper servers. 2 Ops.
White listed so mail to [email removed] to apply for access and the server address.

This is the world from my whitelist server. However, this version doesn't have any ores in it because of the antiXray plugin I have installed. There is an extensive rail network connecting just about everything, several castles, and even a town in the sky. (The rail network needs minecart mania's autocart to work properly) There is an extensive cave system, and quite a few other surprises as well. If you want to join the server just go to: http://tux2mc.tk

Poundcraft - 24/7 Freebuild Server
http://www.minecraftforum.net/topic/1514767-new-247-poundcraft-putting-the-free-back-in-freebuild-whitelist/

The main world as of 7/7/2011

This is the world of my minecraft server. It is currently running canary B5 and has most advanced chest lock technology, tnt repair, and fire spread disabled.

A small 8 player server hosted by Multiplay. If you want more information or want to join the server look here: http://www.minecraftforum.net/topic/368429-buttkicers-survival-creative-crossover-forever-day