While Steam has its share of indie titles, it doesn't have everything. If you're looking for video games really off the beaten path, Itch.io is a store and app that features all kinds of experimental and independent titles.
Like Steam, Itch.io is both a web app and a desktop app. On the site, you'll find all kinds of games, ranging from small, experimental titles that come from game jams to bigger, totally independent games that cost a few bucks. There's something for everyone here and Itch.io makes a great companion to Steam for anyone looking for something a little different.