EmuNations

jgenesis is an open-source, multi-system emulator written in Rust that focuses on accuracy, performance, and cross-platform support. It primarily emulates Sega Genesis / Mega Drive, Master System, Game Gear, and NES, with a strong emphasis on cycle-accurate behavior...

Flycast is a SEGA Dreamcast, NAOMI and AtomisWave emulator which was forked from Reicast. It's well regarded and supports multiples peripherals, texture upscaling, widescreen, Dreamcast Live fan servers and much more...

Nostlan (formally Bottlenose) is a high quality front-end launcher for gaming emulators which supports Windows, Linux and MacOs. It's currently capable of launching more mainstream emulators with nice features and its future looks quite bright!