Hello, i try to find list of all games which you can add from steam platform to GOG, but i can't find it. Only on some websites is sometimes mentions that few tiltes are awible now in gog conection. Someone maybe know where find list of all games that you can connect?

English isn't my native language so sorry for my mistakes

Sorry that i'll have to deliver the bad news to you, but GOG Connect as been discontinued as of now. There are currently no games you can add.

Even before it was discontinued games were available to claim only for short, limited time (and only few at the time).

I'm not sure if i understood your question right, but for clarifications sake, it worked somewhat like this: When you linked your GOG account with your Steam account through GOG Connect, the compatible games would be added to your GOG library. So you would own the GOG versions of games you already owned on Steam as if you bought them twice.

If your question was about whether starting your Steam games through Galaxy required the Steam client as well, the answer would be yes. You need to run Steam to start Steam games through GOG Galaxy.

Basically the games list on GOG Connect comes and goes and is never available for long or many games.

And some months ago, GOG reported they had put the service on hold for an undefined period. They did not remove the page however, so I imagine it might come back at some point.