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Steam features never fail to amaze me
(programming.dev)
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
Being someone with a bad internet, this is actually quite a useful feature. It saves me from either having to set up an smb/ftp share on a computer or backing up a game to a USB drive to restore it on the other computer if I don't want to wait 10 hours for any modern game to download.