serial-unix is used at run time in 118 crates (of which 20 optionally). It is a direct run-time dependency in 3 crates. It's used only as a dev dependency in 75 crates.

Depender (with downloads and own rev deps) serial-unix version
56K 62 serial =0.4.0
mote ^0.4.0
draw_bridge ^0.4.0