CPUlator is a web-based simulator and debugger that allows users to simulate and debug computer systems, specifically processors and I/O devices. It supports instruction sets such as Nios II, ARMv7, and MIPS, and offers optional I/O devices for each system. One unique feature of CPUlator is that it runs entirely inside a web browser, eliminating the need for any installation. The simulator also includes a variety of debugging options, such as single-step, breakpoints, and memory and register examination. It was initially developed for Nios II in 2016 and has since added support for ARMv7 and MIPS32r6.
https://cpulator.01xz.net/