Mesen
NES

Mesen is a high-accuracy NES emulator for Windows and Linux. It offers numerous features, such as save states, video filters, netplay, rewinding, overclocking, cheat codes and HD packs.

It also includes an extensive set of debugging tools for homebrew development or romhacking.

GitHub

Mesen-S
SNES / GB / GBC

Mesen-S is a high-accuracy SNES emulator for Windows and Linux. Game Boy and Game Boy Color games are also supported, along with Super Game Boy emulation.

It contains most of the features found in Mesen, including an extensive set of debugging tools.

GitHub