unicorn-engine is used at run time in 3 crates (of which 1 optionally). It's used only as a dev dependency in 1 crate.

Depender (with downloads and own rev deps) unicorn-engine version
ross-emulator ^2.0.0-rc3
udbserver ^2.0.0-rc7
pwntools optional ^2.0.0-rc5
1 lancelot dev ^2.0.0