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At the end of the day, that's the immovable object. A free, open-source, high-performance interpreter for K would get cease-and-desist-ed into oblivion by virtue of competing with the commercial implementation. That's why I made mine a toy: fun to tinker with, but not fast enough to give anybody ideas. Kinda sucks, huh?

Have you seen ngn/k? It was released under the AGPL recently, and is pretty fast.

I just looked at it quickly and it appears to be more than a toy. How about Windows support? File I/O?

There's an AGPL k that works on Linux (ngn's), but not one that works on Windows. "Production-ready" is a misnomer for this, though; if you want production-ready k, just buy it from atw.

One came out a little over a week ago https://bitbucket.org/ngn/k/src/master/