SangNom2

Reimplementation of the old MarcFD's SangNom filter. Output is not completely but mostly identical.
What's different

    It's open source
    Correct borders processing
    Additinal colorspace support
    Multithreading support
    Requries SSE2

Singlethreaded performance is mostly identical to the old version despite this plugin using SSE2.
Y8

One of the most important differences is Y8 support in AviSynth 2.6. This enables much faster antialiasing (especially when used with FTurn plugin) without any chroma processing.

function maa(clip input) {
    mask = input.mt_edge("sobel",7,7,5,5).mt_inflate()
    aa_clip = input.ConvertToY8().Spline36Resize(width(input)*2,height(input)*2).FTurnLeft() \
    			   .SangNom2().FTurnRight().SangNom2().Spline36Resize(width(input),height(input))
    return mt_merge(input,aa_clip,mask,u=2,v=2) 
}

Multithreading

This plugin uses min(number of logical processors, 4) threads to do its job. You can control number of threads using the threads parameter. In my tests performance doesn't get any better when using more than 4 threads.

Internally it uses a simple thread pool but I do consider switching to avstp if it gets a bit nicer api.
Chroma processing

Originally, SangNom always assumes aa=0 for chroma processing. This makes some use cases harder to implement, so additional parameter aac was introduced. It's the same as aa but for chroma. Default value is 0 to maintain backward compatibility.
License

This project is licensed under the MIT license. Binaries are GPL v2 because if I understand licensing stuff right (please tell me if I don't) they must be.