SPMC is used at run time in 33 crates (of which 1 optionally). It is a direct run-time dependency in 17 crates. It's used only as a dev dependency in 6 crates.

Depender (with downloads and own rev deps) SPMC version
170 1 vomit-m2sync ^0.3.0
140 6 jubako ^0.3.0
110 2 vomit-sync ^0.3.0
aleo-wasm ^0.3.0
aem-eye ^0.3.0
bgapi ^0.2.2
2 tokio-http2 ^0.2
obnam ^0.3.0
build_pbf_glyphs ^0.3.0
gosh-remote ^0.3.0
hrekt ^0.3.0
mula ^0.3.0
cargo-cleansubdirs ^0.3
ghopac ^0.2.2
qrep ^0.2.2
hostparser ^0.3.0
sotahyper ^0.2
7.5M 3386 hyper dev ^0.3
2.6K 3 hyper_imp dev ^0.3
1.9K 7 hyper_wasi dev ^0.3
burst-pool dev ^0.2.2
1 rama-hyper dev ^0.3
anony dev ^0.3.0