DBGL - DBGL is a free, open source, multiple frontends for DOSBox.
Mesen - Mesen is a NES/Famicom emulator and NSF player.
RetriX - RetriX is an emulator front end for UWP, on all the hardware platforms it supports: it serves the...
Nestopia - A portable and cycle-accurate NES emulator written in C++
Terminal Launch V - For those that want a clean, simple fast emu frontend.
FCEUX - FCEUX is a Nintendo Entertainment System (NES), Famicom, and Famicom Disk System (FDS) emulator.