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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.
Methods
Method name  Description  Return type 

bit.tobits(n)  Converts a number to an array (numericallyindexed table) containing the corresponding binary bit values  table the bits making up the value n, with entries up to the mostsignificant 1 bit in n 
bit.blshift(n, bits)  Shifts a number left by a specified number of bits  int the value of n shifted left by bits bits, which is equivalent to n×2bits 
bit.brshift(n, bits)  Shifts a number right by a specified number of bits  int the value of n shifted right by bits bits, which is equivalent to ⌊n÷2bits⌋ 
bit.bxor(m, n)  Computes the bitwise exclusive OR of two numbers  int the value of m XOR n 
bit.bor(m, n)  Computes the bitwise inclusive OR of two numbers  int the value of m OR n 
bit.band(m, n)  Computes the bitwise AND of two numbers  int the value of m AND n 
bit.bnot(n)  Computes the bitwise NOT of a number  int the value of NOT n 
bit.bnot(bit_tbl)  Converts an array (numericallyindexed table) of 0 and 1 values representing a number in binary into that number  int the number resulting from the conversion of bit_tbl from binary 