Hot is macOS menu bar application that displays the CPU speed limit
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++
Simple single cycle processor based on triadic Harvard architecture.
Embedded Real-Time Operating System (RTOS)
A 65C02 Emulator for Microchip PIC24/33
Quantum Leaps (QPC) DPP example with LWIP on STM3220G eval board
Java-based instruction level emulator of MSP430. Code on github.
For those interested in learning about Microprocessors