@Los Grabbed CC3, SMAC, X-COM: Apocalypse and Incoming. I tend to like Gog for the retro games still. Going to wait for Steam sale for more. Steam deck has definitely caused me to prefer steam a little bit more even though I do play games from other stores with Lutris/Heroic on it.
Summer Sale is live on GOG - Summer Sale deals up to -90% (www.gog.com)