ComputerCraft API's

API's included in Tekkit 3.1.2 (Under Construction)
Wikipedia defines an API as "An application programming interface (API) is a specification intended to be used as an interface by software components to communicate with each other. An API may include specifications for routines, data structures, object classes, and variables." in Tekkit the API's make it possible to tie your programs into your World and write better programs.

Bit API
The Bit API is for manipulating numbers using bitwise binary operations in Computer Craft.