[type0]

Correct me if i'm wrong but postcss is js or node.js only, where's sass is trivial to add with any language.

[MarvelousWololo]

I'm not totally sure but I think that for Sass only you'd still need Ruby or Node.

[serial_dev]

Sass has LibSass which is a C++ port of the Sass engine (which was originally written in Ruby). There are wrappers available in many languages, such as Go, Java, Node, PHP (and even Ruby, interestingly enough).

https://sass-lang.com/libsass