extsort is used at run time in 8 crates (of which 3 optionally). It is a direct run-time dependency in 4 crates.

Depender (with downloads and own rev deps) extsort version
370 1 extindex ^0.4
hibp_downloader ^0.4.2
ggca ^0.4.2
500 4 exocore-store optional ^0.4.2