GCD is used at run time in 266 crates (of which 30 optionally). It is a direct run-time dependency in 25 crates. It's used only as a dev dependency in 42 crates (of which 2 directly).

Depender (with downloads and own rev deps) GCD version
60K 108 fugit >=2.1, <3.0
16K 14 p3-poseidon2 ^2.3.0
3.7K 3 rp235x-hal >=2.1, <3.0
1.7K 1 rustscan ^2.0.1
1.5K 1 htb ^2.1.0
850 5 ckb-std ^2.3
480 typus_fugit >=2.1, <3.0
340 1 uu_dd ^2.3
miratope ^2.0
3 relp-num ^2.3.0
4 const-frac ^2
1 klavier-core ^2.1.0
1 monument ^2.3.0
1 audio-engine ^2
hesp-manifest ^2.3
1 timestamp-stretcher ^2.0.1
p3-rescue ^2.3.0
quaru ^2.3.0
qalqulator ^2.1.0
prime_bag ^2.3.0
floating_bar ^2.0.1
repetend_len ^2.3.0
ucsi ^2.3.0
miter ^2.0.1
numerous ^2.3.0
1.7K 2 stable-hash dev ^2.1.0
250 hfs dev ^2.3