A dead project due to the shear complexity and obfuscation and proprietary bug/feature weirdness (e.g. undocumented relied upon in some edge case feature/bugs tend to exist in proprietary single-implementation systems) of flash.
Things like Mono took a decade to finish as an exact clone of a portion of Microsoft's implementation, and that was only possible because the people using it (the target audience begin linux programmers) could fix the code as needed. Flash's target audience is artists.
http://mozilla.github.io/shumway/