Onboard C is a free, open source C compiler and tools package to compile and build code on a Palm OS handheld device.
Homepage: http://onboardc.sourceforge.net/
The Onboard C package includes the OnBoard? C compiler, the OnBoard? Assembler, the SrcEdit programmer's editor, and the Sherpa porting tool. Onboard C can compile to a Palm executable or a Hackmaster hack.
The tejpWriter viewer/editor for Palm OS devices is written in Onboard C.