Credits / Links

Learning

Not Risc-v related, but very interesting to learn low level stuff

Write your own virtual machine
Uxn

Simulator

RARS -- RISC-V Assembler and Runtime Simulator

Other implementations

https://github.com/cnlohr/mini-rv32ima/ https://github.com/racerxdl/riscv-emulator
https://github.com/edubart/riscvm

Testing

picorv32
About the Testing of My Simple RISC-V Core (regymm(Peter Gu)'s Blog)