SPMC is used at run time in 34 crates (of which 1 optionally). It is a direct run-time dependency in 18 crates. It's used only as a dev dependency in 10 crates.

Depender (with downloads and own rev deps) SPMC version
1.2K 2 vomit-sync ^0.3.0
110 pathbuster ^0.3.0
1 vomit-m2sync ^0.3.0
build_pbf_glyphs ^0.3.0
hostparser ^0.3.0
2 tokio-http2 ^0.2
obnam ^0.3.0
gosh-remote ^0.3.0
hrekt ^0.3.0
6 jubako ^0.3.0
mula ^0.3.0
ghopac ^0.2.2
qrep ^0.2.2
bgapi ^0.2.2
cargo-cleansubdirs ^0.3
sotahyper ^0.2
aem-eye ^0.3.0
aleo-wasm ^0.3.0
11.7M 3561 hyper dev ^0.3
3.1K 3 hyper_imp dev ^0.3
2.2K 1 rhyper dev ^0.3
1.6K 1 hyper2 dev ^0.3
490 7 hyper_wasi dev ^0.3
140 supply-chain-trust-example-crate-000081 dev ^0.3
1 rama-hyper dev ^0.3
burst-pool dev ^0.2.2
anony dev ^0.3.0
1 hyper-patch dev ^0.3