Sour just released Mesen 2. This combines Mesen and Mesen-S in a new framework.
It can emulate the NES, SNES, Gameboy/GBC, and PC Engine.
It’s reportedly much faster than previous versions, which is great news.
Mesen is loved in the NES developer scene for its accuracy.
For Win & Linux.
Build here:
https://github.com/SourMesen/Mesen2/releases
Source here:
https://github.com/SourMesen/Mesen2/