Do you mean that you want a different IDE or a compiler? Microchip's mcc18 compiler is really the only compiler that works for the PIC. Howeverm if you're looking ata different IDE, there are a lot of options, such as DevC++ and CodeBlocks. Our team uses CodeBlocks, since we find its plugabble architecture nice for any extra functionality we want to add, and its pretty easy to add a new compiler. You just add new compiler and add the linkers and libraries and compile flags, which you can get from a build log in MPLAB.