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Ubisoft Returning to Day 1 Steam Releases Starting With Assassin's Creed Shadows
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Steam is a video game digital distribution service by Valve.
Steam News | Steam Beta Client news
Useful tools:
SteamDB
SteamCharts
Issue tracker for Linux version of Steam
I’m no expert in the matter but from what I gather here Steam Keys and in other comments around the web, Valve allows free key “generation” for resale in other stores.