OpenPoplog is a multi-language, incrementally-compiled virtual machine-based development environment with its own extensive teaching and support material, supporting the languages Pop-11, Prolog, Common Lisp and ML on Unix, VMS, Linux and Windows.
HP-GCC aims to provide a C compiler for the HP49G+/HP48gii series of Graphing Calculators. It is based on GCC, with various calculator specific extensions.