Picsim is a projects to create an assembler and simulator package for Pic microcontrollers.  Pics are a family of RISC microprocessors by Microchip, which are commonly used to control electronic devices.

Current status (1998.06.16) : Control window can now load in Intel hex files and display a disassembly. Single step emulation works now, but needs a bit of tidying. Version 0.1 available here. Hopefully the assembler will be spitting out code soon.