Paul Holden, the creator of Daedalus, one of the most well-known N64 emulators, has done it again with his latest project.
The project is currently in its early stages, and though it doesn't work very well, you can try it out here. You'll have to have some N64 ROMs lying around, though we can't tell you where to find them, because ROMs are evil and bad. Obviously.
Read more about it on Holden's blog and let us know what you think in the comments or on Twitter.