I was particularly fond of the onboard programming environments for PalmOS. For example, cbaspad: http://www.nicholson.com/rhn/palm.html http://www.nicholson.co

I was particularly fond of the onboard programming environments for PalmOS. For example, cbaspad: http://www.nicholson.com/rhn/palm.html http://www.nicholson.com/rhn/palm.html Most of the links on that page are broken, but you can download the interpreter from archive.org: https://archive.org/details/tucows_34107_cbasPad https://archive.org/details/tucows_34107_cbasPad It's a wonderful classic BASIC that even supports goodies like peek(), poke and call(), access to the serial port, graphics, pen input and more. There were also C compilers (OnboardC), Forth implementations (Quartus Forth), a Scheme (LispMe) - all enabled by the robust text input capabilities of the device. edit: There's an interesting paper about the making of LispMe: http://3e8.org/pub/LispMe.pdf http://3e8.org/pub/LispMe.pdf