PIC
From Wildsong
PIC Microprocessor Resources
http://www.embeddedrelated.com/ EmbeddedRelated web site, and the mailing list: PIClist
High Level Languages
Basic language
http://www.BasicMicro.com/ -- "Atom", a mostly Stamp compatible PIC platform. Includes IDE and debugger.
http://www.crownhill.co.uk/section.php?section=1 Proton Basic
http://www.melabs.com -- Maker of 'PICBASIC' compiler.
http://www.picant.com/c2c -- C, C++, and Pascal for the PIC. low cost (< $100)
http://www.xcprod.com/titan/XCSB - optimising structured PIC BASIC compiler
C language
The MPLab development software from Microchip includes a free version of the Hi-Tech C compiler called PICC LITE. Hi-Tech also has commercial versions of the PICC compiler.
http://www.ccsinfo.com/picc.shtml expensive option
http://www.fored.co.uk/ Wiz-C