GCD is used at run time in 292 crates (of which 37 optionally). It is a direct run-time dependency in 25 crates. It's used only as a dev dependency in 44 crates (of which 2 directly).

Depender (with downloads and own rev deps) GCD version
53K 115 fugit >=2.1, <3.0
30K 15 p3-poseidon2 ^2.3.0
7.1K 3 rp235x-hal >=2.1, <3.0
1.3K 1 rustscan ^2.0.1
1.2K 1 htb ^2.1.0
850 7 ckb-std ^2.3
350 1 monument ^2.3.0
280 1 uu_dd ^2.3
150 typus_fugit >=2.1, <3.0
100 miter ^2.0.1
hesp-manifest ^2.3
floating_bar ^2.0.1
miratope ^2.0
3 relp-num ^2.3.0
1 timestamp-stretcher ^2.0.1
4 const-frac ^2
1 audio-engine ^2
1 klavier-core ^2
p3-rescue ^2.3.0
qalqulator ^2.1.0
prime_bag ^2.3.0
quaru ^2.3.0
numerous ^2.3.0
repetend_len ^2.3.0
ucsi ^2.3.0
1.6K 2 stable-hash dev ^2.1.0
hfs dev ^2.3