Mesen v0.4.1 is released. Mesen is a NES/Famicom emulator and NSF player. It is still a work in progress - some features are currently incomplete or may change in future versions.

Mesen Features:
* High Accuracy - A lot of effort has gone into making Mesen as accurate as possible
* Stand-alone - Put the Mesen application into any folder and run it from there
* Supports: Save States, Movie/Audio Recording, Screenshots, Cheat Codes
* Supported Mapper List (130+): 0 to 13, 15 to 19, 21 to 27, 32 to 34, 37, 38, 44, 45, 47, 49, 52, 57, 58, 60 to 62, 64 to 80, 82, 85 to 89, 91 to 95, 97, 99, 101, 107, 112, 113, 115, 118, 119, 137 to 141, 143 to 157, 159, 163, 164, 176, 180, 184, 185, 189, 191 to 195, 200 to 203, 205 to 207, 210, 218, 225 to 228, 230 to 232, 240 to 243, 246
* NES and Famicom (including Famicom Disk System) support. Also supports: NSF, NSFe, VS System
* Net Play - Play online with friends
* Automatic updates - Mesen is able to check for updates and automatically install new versions of itself.
* Built-in Debugger
* Other Features: 7z/zip archive support, numerous　video filters (xBRZ, Scale2x, NTSC, etc.), sound recorder, sound effects, etc.

Mesen v0.4.1 Changelog:
New Features:
- Compatibility: Added support for 18 new mappers (114, 120, 121, 136, 168, 183, 188, 204, 213, 214, 222, 229, 233, 238, 244, 253, 254, 255)
- Compatibility: Improved support for NES 2.0 headers.
- Input: Added support for the Oeka Kids Tablet.
- MMC1: Fixed issues with some games and added support for RAM read/write protection.
- MMC3: Added support for ram read/write protection.
Bug Fixes:
- Audio: Fixed a bug in the square channel's sweep units - fixes audio distortion in some games.
- Input: Fixed limitations with keyboard input and fixed an issue with XInput controllers.
- Cheats: The "Delete Selected Cheats" button now works.
- Video: Loading a game while in fullscreen mode no longer resets the video scale.

Download: Mesen v0.4.1
Source:Here