Its MPLAB an IDE for different assembler,compiler,debugger and many different tools for Microchip's MCU.What is Maplab & I2c
About I2C its a communications protocol developed by Philips...
More on I2C http://en.wikipedia.org/wiki/I%C2%B2C
Or you may be referring to ICD2 i.e... In Circuit Debugger 2,its used to debug code for Microchip's MCU as well as to program the MCU.
More on ICD2 : http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en010046
Good Luck