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Pony is a relatively young but interesting language with capabilities-security.
In a completely different vein: Ecstasy. (We recently began to write an Intro to the language, and there's a blog.)
If you're looking for stuff pushing the boundaries of PL research, Agda (especially Cubical Agda) might be cool to look at. It's got lots of cutting edge stuff in it, pushing the boundaries of what is currently possible with dependent type theory. It's not the only language out there with cubical features (see also: cooltt), but it's probably one of the more fleshed-out implementations in terms of being practically useful. The 1Lab makes heavy use of it. There's also Introduction to Univalent Foundations of Mathematics with Agda that might be interesting to look at too!
If you're looking for stuff pushing the boundaries of PL research, Agda (especially Cubical Agda) might be cool to look at. It's got lots of cutting edge stuff in it, pushing the boundaries of what is currently possible with dependent type theory. It's not the only language out there with cubical features (see also: cooltt), but it's probably one of the more fleshed-out implementations in terms of being practically useful. The 1Lab makes heavy use of it. There's also Introduction to Univalent Foundations of Mathematics with Agda that might be interesting to look at too!
I'd also recommend checking out Koka and Effekt which are doing cool things with effect systems. You can see more languages in this space in this bibliography. Effect systems are pretty exciting as they can be used as an alternative to async/await (see the work on Multicore OCaml, for example).
Related posts
- Types versus sets (and what about categories?)
- If given a list of properties/definitions and relationship between them, could a machine come up with (mostly senseless, but) true implications?
- What can Category Theory do?
- What the imperative shell of an Functional Core/Imperative Shell language looks like
- Algebraic Effects: Another mistake carried through to perfection?