This is a infection style game were there is a Human team and a Zombie team. The aim of the game is for the Humans to survive the time limit with out the zombies killing them. When a zombie kills a human they turn to the dark side with the other zombies to power the zombie team over the humans. This plugin works well with the Plugin: DisguiseCraft (Ik the server already has) as it allows all the players on the Zombie side to look like any mob you want. By default its zombie pigman, zombie, zombie villager (I'm not sure on a baby zombie/baby villager zombie). When you type the command /inf join or /infected join it will take you to the Infected lobby were you can choose a Human class, choose one of the maps the server is offering, or buy grenades from the shop. The grenades are totally configurable on what they do, how there named, and how much they cost. There is a top 5 leader board on there score, deaths, kills and points. The command for the leader board is: /inf top <score/points/kills/deaths>. The arenas are claimed by World Edit. You have the availability to create signs to access the lobby (/inf join), leave the lobby (/inf leave)buy items from the shop and vote for the map. Once the match has ended you will be sent back to the lobby and you can continue on with playing. If you have decided to not play another match, clicking the leave sign or typing /inf leave.
Plugin: Infected
Bukkit.org link: http://dev.bukkit.org/bukkit-plugins/infected-core/pages/commands/
I hope you like it!