Computercraft is a mod created for Minecraft by Dan200 that adds Computers, Modems, Monitors, Printers and more! ComputerCraft's Computers and Turtles are programmed with an easy-to-learn LUA Programming Language. You can use Redstone, Redpower or even MineFactory Reloaded alongside wiht your devices for the best experience.
ComputerCraft has it's own official wiki, find all the recipies here.
ComputerCraft on Parsonage.Edit
Parsonage has ComputerCraft loaded into it's modpack. However you can only use mining turtles in the mining world(City World). Regular turtles and ComputerCraft computers can be used in any world.
ComputerCraft is one of Gazzacks favorite mods.