-USB Host Sheild 2.0
- https://www.circuitsathome.com/products-page/arduino-shields/usb-host-shield-2-0-for-arduino
- https://www.circuitsathome.com/products-page/arduino-shields/usb-host-shield-for-arduino-pro-mini
-USB Host Sheild 2.0 source
- https://github.com/felis/USB_Host_Shield_2.0
-Arduino USB Host Shield(with bootst converter)
- http://arduino.cc/en/Main/ArduinoUSBHostShield
-Arduino source
- https://github.com/arduino/Arduino/hardware/arduino/{cores,variants}
-Initial release of TMK USB-USB converter
- https://geekhack.org/index.php?topic=33057.msg653549#msg653549
- http://deskthority.net/workshop-f7/is-remapping-a-usb-keyboard-using-teensy-possible-t2841-30.html#p74854
-Arduino-based hardware keyboard remapper - Colemak forum
- http://forum.colemak.com/viewtopic.php?id=1561
-Teensy + Host Shield
- http://www.pjrc.com/teensy/td_libs_USBHostShield.html
+### USB Host Sheild 2.0
+- https://www.circuitsathome.com/products-page/arduino-shields/usb-host-shield-2-0-for-arduino
+
+### USB Host Sheild 2.0 source
+- https://github.com/felis/USB_Host_Shield_2.0
+
+### Arduino USB Host Shield(with bootst converter)
+- http://arduino.cc/en/Main/ArduinoUSBHostShield
+
+### Arduino source
+- https://github.com/arduino/Arduino/hardware/arduino/{cores,variants}
+
+### Arduino-based hardware keyboard remapper - Colemak forum
+- http://forum.colemak.com/viewtopic.php?id=1561
+
+### Teensy + Host Shield
+- http://www.pjrc.com/teensy/td_libs_USBHostShield.html