GOG have joined in on the Early Access hype and have opened up their store to allow a few select titles in. They even offer a 14 day refund option for titles in development. This refund option is a no questions asked deal, which is pretty awesome.
Project Zomboid (-40%)
The Curious Expedition (-15%)
TerraTech is also on GOG, but no Linux version on GOG currently. I guess they found issues during their testing, but who knows.
Now, hurry up with GOG Galaxy.
About the author - Liam Dawe