A microprocessor simulator for unit testing assembly code in embedded systems. Written in pure Java, it works with JUnit on any platform Java supports. Micros include 6502, 6800, 8051, Z80, and others.
The Wolfram Machine project is an effort to create a set of documentation and useful modules (both hardware and software) for a computing architecture based on the mathematical theories presented in Steven Wolfram's book _A_New_Kind_of_Science_.
Jaimy is a fledgling J2ME simulator framework on top of J2SE. It is pretty useful to mobile Java developers, as it shortens the time needed to see any changes to code (no more compile-preverify-package-emulate, just comiple&run).
This project is based on sources published by original Ataroid developer, who in turn used code of Stella.
This project is abandoned in favor of Droid2600: https://code.google.com/p/droid2600/. Available sources do not compile into anything working anyway.
This project is based on sources published by original psx4droid developer (or someone else – I don't care as it is all GPLed anyway), who in turn used code of PCSX-ReARMed, forked from PCSX-Reloaded, based on PCSX-df and original PCSX...
This project is abandoned in favor of libretro PCSX-ReARMed variant: https://github.com/libretro/pcsx_rearmed. Current sources already depend on recent version of platform anyway.