Voidity

Voidity is the most feature-packed, stable, and bug-free server mod for Minecraft since 1.5.1.
Here are the best of the more than 50 features:

Better server crew handling: admins, and configurable ops
Arena with achievements
Dual credit system with wallet, production, transfer, and command block support
Account, Building, and Chest Protection
Game mode changing line
Rocket Launcher. Just sayin'
Welcome messages (this is new too), and some server-side text can be set
Config files can be reloaded ingame, no need to stop the server
Teleportation lock (prevent others teleport to you, configurable, has command)
Save your teleport locations, and jump to them later
Guest teleportation, but only to players
Everything is configurable
Tons of new chat commands, like backup or math, and lots of other custom functions

Apr. 1. 2013.

1.6.4 Release 1.0

Download Voidity!
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Help the development of Voidity and raise the chance of upcoming updates by a small donation!

Donations help me create:

Public Voidity server(s)
Global stats and leaderboards for anyone who played on a Voidity server
Central cheater and rulebreaker database (if a player is banned on enough servers, it will spread to other Voidity servers)
Independent and ad-free website server

Quote from Help:
Visit these sites for help:
1.6.2 Release 1.4
Read Me
1.6.4 Release 1.1
Read Me

Quote from Site:
Visit these sites for more info:
Visit GunPak
Visit Official Site