I am a developer of BluShell (http://blushell.net/)
We host two unique gamemodes, Fortwars 3 and Puzzles.
Fortwars 3 is a remake of the famous Fortwars gamemode by the once great community, Darkland Servers. The lead developer of it, SW, was also the lead developer of Fortwars when it was under Darkland. We still consider Fortwars to be a WIP which is why we haven’t advertised it much. However, many people play it regardless.
Puzzles is a gamemode based on the js_build_puzzle Half-Life 2: Deathmatch maps made by DST Studios (dststudios.co.uk). I’m the lead developer for Puzzles, and I’ve been playing these maps for a very long time. More information is here: http://forum.facepunch.com/showthread.php?t=1248618 (I haven’t updated the thread in a very long time)
As of right now Fortwars is empty, mainly due to the time of day. Puzzles has a bit of people in it.
In addition, BluShell is soon going to open a server to test our new gamemode, Dominion.
I’m not sure if I’m allowed to advertise my own servers or not.