"GMod Tower is a project comprised of many different unique gamemodes hoping to build a diverse community.
Essentially, the server (or tower) acts as a base for all the gamemodes it contains. You are not limited to one type of gameplay. The community forms what makes the tower interesting and the community controls how it's ran.
In the tower, you will have access to personal suites, stores (for upgrading), a whole batch of unique gamemodes, and more.
There are plenty of well-thoughtout features/systems for your connivence. Trading (including currency exchange), grouping, private chatting, queuing, upgrades, awards (similar to achievements), and hand-picked administrators, just to name a few."