We're thinking of writing up a syntax highlighter for our site and enabling it on our programming tag (either using a user script or by asking the SE devs). Unfortunately, Google Prettify, which SE uses, doesn't support quantum programming languages. Yes, Qiskit is similar to Python and Q# is similar to F# and C#, but that would lead to non-uniform highlighting when writing quantum programs.
Are there already open source syntax highlighters for quantum languages like Qiskit, Q#, PyQuil, etc.? Or do there exist sources having complete lists of syntax for the quantum programming languages? Basically, I'm looking for something like this. Please write one answer per language!
Alternatively, if you wish, you could prepare a list of syntax for one or more languages, in the form of answers. We'll collaboratively try to improve on them.
Note: Oh, and today is Quantum Computing's birthday. :)