HoRNDIS is a driver for Mac OS X that allows you to use your Android phone's native USB tethering mode to get Internet access. HoRNDIS is implemented as a kext, rather than as a user-space program that opens a TAP or TUN device; this means that it does not conflict with other TAP/TUN kexts that you might have installed (like OpenVPN, Tunnelblick, or Cisco VPN).
