unicorn-engine is used at run time in 4 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
800 nuttx-arm64-emulator ^2.1.3
150 udbserver ^2.1
ross-emulator ^2.0.0-rc3
pwntools optional ^2.0.0-rc5
1 lancelot dev ^2.0.0