FTDI is used at run time in 3 crates (of which 1 optionally). It's used only as a dev dependency in 4 crates.

Depender (with downloads and own rev deps) FTDI version
4.5K 10 ftdi-embedded-hal optional ^0.1.3
obd2 ^0.1
jtag ^0.1.3
320 bme280-rs dev ^0.1
250 mpr121-hal dev ^0.1.3
140 scd4x-rs dev ^0.1
asp5033 dev ^0.1.3