Emulation/NES

About the Nintendo Entertainment System
The Nintendo Entertainment System and Famicom are historically and culturally important home video game consoles of the 1980's. A number of important series either saw their start on the Famicom or NES.

FCEUX
FCEUX is an open source NES emulator.

PuNES
PuNES is an open source and highly accurate emulator.

Mesen
Though the open source Mesen was discontinued in 2020, it is commonly considered among the best NES emulators. It is noted for its ability to apply 3rd party texture packs to games, greatly enhancing graphical fidelity and creating a remix culture of sorts among its users.

Nestopia
Nestopia is an open source NES emulator focused on accuracy.

As of 2021 the original project is abandoned, but it's successor fork Nestopia UE (Undead Edition) remains relevant.

Others

 * NESticle - An early freeware emulator for DOS and Windows 95 based PCs. Now only used out of historic interest or on low spec PCs from the early 1990s.