Mesen is both an NES and Famicom emulator and an NSF player.

Features:

High Accuracy: A lot of effort has gone into making Mesen as accurate as possible.
High Compatibility: Over 220 mappers supported (all licensed games supported)
NES, Famicom, Famicom Disk System, Dendy, VS System, NSF and NSFe emulation is supported.
General: The Save States, Rewinding, Movie/Audio Recording, Overclocking, Cheat Codes.
Video: Numerous video filters, customizable palettes/overscan, support for HDNes' HD packs.
Audio: Stereo effects, per-channel volume and panning, equalizer, etc.
Misc: Netplay, 7z/zip support, IPS/BPS patch support, automatic updates, and more.

As we have no ROM's, we were unable to review Mesen thoroughly. However, as always, it has been scanned and tested in VMware.