Import your games from 5 other platforms to Steam
One of Steam's users has created a useful tool that allows one-click import of Valve games from most other launchers to the Steam client. Thanks to this, we can use many useful functions, such as Steam Overlay, home streaming or Big Picture mode. And we have everything in one place.

There is a possibility of importing games to the client of Valve platform, but not everyone wants to do it. The handy SteamGridDB Manager utility comes with help and allows you to transfer all titles with one click. Similarly to manual import, we will be able to use a number of Steam functions, such as Steam Overlay, Steam Input, Big Picture mode or home streaming (e.g. using Steam Link). The program works with most launchers available on the market, and its creator ensures that future support will be added. In addition, we can decorate each game with one of the images selected from a fairly extensive database.
Please note, that program is still in beta phase (v.0.2.4 at the moment).
Well, at this moment one of the most universal multilaunchers is probably GOG Galaxy 2.0 (but you need to have other gaming clients installed).
