USB tethering driver for OS X
http://joshuawise.com/horndis Formula was removed
Last version was

Recent formula history

Anastasia Sulyagina horndis: move to Homebrew Cask (#2924)
Nikolaus Wittenstein Add descriptions to all remaining homebrew packages
Baptiste Fontaine horndis 7
Dominyk Tiller Add unsigned kext requirement.
Brett Koonce HoRNDIS rel6

Formula code at GitHub