I just recently discovered this emulator while browsing through the emugen wiki and it's apparently the most accurate NES emulator at the moment, passing all the TASVideos tests but scanline/scanline. This means it has 99.4%:
http://www.mesen.ca/TestResults.php
It also has a bunch of interesting features, including netplay, an automatic updater, and a bunch of filters for the games. It also has 216 mappers total and the author is adding more. Here's a link to the main website where it can be downloaded:
http://www.mesen.ca/
I'm surprised no ones ever talked about this emulator on here. I couldn't find a thread for it so I figured I'd make one. Does anyone know how accurate Mesen
truly is?
I should also point out that it currently has no TASing features implemented into it but I wouldn't be surprised if they are put in later. It actually has some TAS features, but they are still at an early stage and very basic (thanks Spikestuff).