[raiph]

Couple suggestions:

* Ponylang. Pure Actor model. Static typing to enforce safe concurrent semantics in almost all respects. Plus ORCA GC. Upshot: high performance, and type theory grounded guarantees of no deadlocks, no livelocks, and no data races. Chief downsides are that MS Research has hired its founder, and it's a fledgling language/community.

* Elixir. Kinda Actor modelish. Dynamic typing, solid community. Someone else has posted about it.

* Raku. Someone else has posted about it. Chief downsides are that it's got slow single core performance and small community. Upsides include ease of use for multi core code. `start` schedules a lambda or function or statement on a virtual thread. cf Go's `go`. No `async`.

[lizmat]

A small, but growing community, I'd say :-)