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As far as I know, it's mostly Andrew Kelley[1] working on Zig, though it seems to be growing quickly now!

[1] https://andrewkelley.me/post/full-time-zig.html

Not a new language, as it’s based on/similar to Ruby syntax, but the latter is interpreted while this one is built from the ground up for compilation/LLVM:

https://crystal-lang.org

xtlang is one; ML meets C with S-expressions and hot reloading.

https://extemporelang.github.io/docs/reference/types/

edit: link is more specific now

Meet Wren: https://github.com/wren-lang/wren

Wren doesn't use LLVM nor claims C-like performance. It's a (fast) dynamic, interpreted language.

Any reference for C-like performance?

With double-NaN pointers I would say no C performance.

Yes, Cone: http://cone.jondgoodwin.com/