Both the Steam Controller and Steam Link are intended to work computers that can run Steam, this includes Macs however technical issues are stopping that from happening. Valve expect an update to solve the current issues.
|Steam Link with free games on Mac|
Currently, the Steam Controller doesn't offer gamepad emulations on Macs. Valve recommends opting into the Steam beta client that enables keyboard and mouse emulation. Gamepad emulation is expected within a few weeks.
|Steam Controller with free games on Mac|
The official launch of the control and Link is November 10th and if you pre-order you'll aslo be entitle to Portal 2 and Rocket League.