With Version 0.5.0 of Lutris , Lutris added GOG support, allowing users to sign-in their account, import games and
download game files automatically during install.

News write-up
https://www.phoronix.com/scan.php?page=news_item&px=Lutris-0.5-Released

Download:
https://lutris.net/downloads/

I use Launchbox and Playnite. I'd use Playnite exclusively if it supported multi-disc games for emulated platforms like PS2.

What? I thought this thread was about the new GoG community manager named Lutris, but instead it`s about... what is this thread about?

A frontend that behaves something like a client, without all the DRM baggage of Steam and without the broken functions of Galaxy. Lutris is Linux specific.

Launchbox performs a similar function, an all in one hub for all your games from different sources. Playnite is yet another one. As front ends, they can get you to the install page for your games from GOG or Steam (or in the case of Playnite, Origin and Uplay as well), and they can launch your emulators for your games with some preconfigured settings for a smooth seamless experience. They take a bit of setting up, but in all, they are generally what people want Steam to be for: a home for all their games.

Oh, interesting. Thx for the info. :-)