Slimefun

Slimefun (Server Plugin)
Slimefun is a plugin which aims to basically turn a Bukkit Server into a modpack like FTB without installing a single mod. It offers everything you could possibly imagine. From Backpacks to Jetpacks... It also adds an API allowing admins to easily install/code Addons. It adds a whole new Layer of Survival to Mianite Worlds by adding more than 400+ new Items!