There are 1 repository under arduino-board topic.
Speed up the functions on your SAMC21 Arduino compatible board
Just another Arduino-LocoNetShield.
Arduino IDE board definitions for ReWire circuit boards
My projects using Arduino Software Platform and Arduino-based Boards
Portable Mobile device-like shield for UNO-like boards; an ingenious extension for the Arduino UNO platform.
Roboracer Alpha Mu™ Testing Sketchs