SPMC is used at run time in 29 crates (of which 3 optionally). It is a direct run-time dependency in 17 crates. It's used only as a dev dependency in 5 crates.

Depender (with downloads and own rev deps) SPMC version
4.1K 4 wasm-bindgen-rayon ^0.3.0
150 2 vomit-sync ^0.3.0
140 aleo-wasm ^0.3.0
110 pathbuster ^0.3.0
2 tokio-http2 ^0.2
bgapi ^0.2.2
obnam ^0.3.0
build_pbf_glyphs ^0.3.0
aem-eye ^0.3.0
hostparser ^0.3.0
gosh-remote ^0.3.0
qrep ^0.2.2
mula ^0.3.0
hrekt ^0.3.0
sotahyper ^0.2
cargo-cleansubdirs ^0.3
ghopac ^0.2.2
4.6M 3150 hyper dev ^0.3
1.2K 7 hyper_wasi dev ^0.3
1.1K 2 hyper_imp dev ^0.3
burst-pool dev ^0.2.2
1 rama-hyper dev ^0.3