It started as a very simple green-parallelism library (spawn/sync/for), but it looks like it has been expanded to include an array syntax for c (a[:] = sqrt(b[:])*c[:])), which will automatically vectorize if possible. It also has`#pragma simd` to hint to the compiler that you want a code block to be vectorized, even if the compiler would otherwise not.

There's something about 'hyper objects' too which sound like race-condition safe objects for doing things like reductions.