Game launchers
Game launchers in this list install and start games. Some are also stores. An open launcher that signs into someone else's store is not a second store, and a store that only sells its own games is not a replacement for a library you already own.
The practical question is which libraries you already paid for. A launcher that does not see those libraries does not replace the one that does. DRM, cloud saves, and Linux support are the fields that actually change the choice. The table shows platform and license so you can see a native store, a console app, and an open wrapper as different rows.