Being Doscember, I want to play some dos games. Is there a way I can list games that use dos or run under dos box? Either on this web site or with Galaxy.
Even the games I know are running under dosbox say nothing about it in their descriptions.

Most of my known Dos games that I own on GOG are either adventure or strategy and I wanted to try some action games.

I hope there is a way without installing them.

https://www.gog.com/forum/general/list_of_gog_games_using_dosbox/page1

Or a google search: "dosbox site:https://www.gog.com/game"

I don't think there's any way to filter them. Although they're rolling out a new store filtering system, and maybe, just maybe, they could add a dosbox tag, but since I don't have it yet (hey, GOG, it's been almost two months since you posted the news!) I can't really check it out. Games using DOSBox have an info at the very bottom of system requirements on their product pages.