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I am using Proton IDE.Its very useful cross compiler having many builtin subroutines eg SPI and UART (both software and hardware),alphanumeric and graphical lcd tools,DTMF,USB interfacing,mathematical subroutines and many others.
in short Proton IDE is designed to accelerate product development in a comfortable user development environment without compromising performance, flexibility or control.
u can download its limited version software from www.picbasic.org which help u a lot to evaluate it.