https://www.gog.com/game/forgotten_realms_the_archives_collection_one

Acclaimed roguelike Caves of Qud by Freehold Games is now available on both GOG.com and itch.io! If you've ever gotten the itch to explore a bizarre world of 70s pulp sci-fi, surrealism, and ever-changing possibilities, now's your chance to dive straight into this acclaimed roguelike on two new...

http://www.pcgamer.com/pc-game-storefronts-compared-what-you-need-to-know-about-retailers-and-resellers/ A list of most of the bigger retailers, where they get their keys, and even the retailer/publisher split where available. Interesting stuff!