Tee is used at run time in 7 crates (of which 1 optionally).

Depender (with downloads and own rev deps) Tee version
3.4K rustup-toolchain-install-master ^0.1
370 git-cinnabar ^0.1
youdusa ^0.1.0
cargo-bisect-rustc ^0.1
cargo-vita ^0.1.0
cargo-3ds ^0.1.0
loalang optional ^0.1.0