St3 is used at run time in 75 crates (of which 1 optionally). It is a direct run-time dependency in 9 crates. It's used only as a dev dependency in 3 crates (of which 1 directly).

Depender (with downloads and own rev deps) St3 version
2.1K 31 smolscale ^0.4
1.2K asynchronix ^0.4
380 5 smolscale2 ^0.4.1
150 work-steal-queue ^0.4.1
130 22 pi-async-rt ^0.4
100 nexosim ^0.4
open-coroutine-queue ^0.4.1
1 base-coroutine ^0.4.0
3 open-coroutine-core ^0.4
1 pi_wrr dev ^0.4