PICBasic Pro Clone?

I am a newbie. Does anyone know of a free/budget Basic compiler that is identical to in syntax and function to PIC Basic Pro? (I don't want to have
to spend over $400 AUD for an IDE and PICBasic Pro compiler).
Or a work-around - like an easy port for a beginner? I want to be able to do the projects in the following books (they both use PICBasic Pro compiler):
PIC Robotics: A Beginner's Guide to Robotics Projects Using the PIC Micro by John Iovine
Insectronics : Build Your Own Walking Robot by Karl Williams
Dale Stewart
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