6800 Emulator runs on Teensy 4 processor
Emulator of the ancient 8 bit microprocessor SC/MP 2
x86 Multi-Core Microprocessor and assembler simulator written in C++
An assembly example
Emulator for the 6502 Microprocessor
A 65C02 Emulator for Microchip PIC24/33
Java-based instruction level emulator of MSP430. Code on github.