I need an app that shows me all the games I own on all platforms. More than once I've bought a game on Steam and realized I already owned in on Epic, or Origin, or Humble, or GOG.
When I _do_ remember, it's tedious to double-check each one. Almost feels worth the effort to catalog my non-Steam games in a spreadsheet just so I have one place to look... except then I'd forget to add new games anyway.
@CarlCravens I use Lutris for a lot of that since it handles multiple sources.
Also, GOG Galaxy on Windows will aggregate all your game lists together.
@CarlCravens GOG can do this (if you connect to all your other accounts).
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