Skein is used at run time in 6 crates (of which 2 optionally).

Depender (with downloads and own rev deps) Skein version
250 libmonero ^0.1.0
rustgenhash ^0.1.0
wholesum ^0.1.0
210 nu_plugin_hashes optional ^0.1.0
110 hash_utils optional ^0.1.0
checksum_dir optional ^0.1.0