I’m not sure how this came across my plate (if you have a tip, tell us) but Demiplane looks interesting. They do matchmaking for online TTRPGs, both sessions and campaigns. DM’s list their games and Demiplane suggests matches based on your interests. DM’s can offer free or paid sessions—a great way to for DM’s to earn some gold to cover the costs of the hobby.

Here’s the part I like:

Specify how into different facets of TTRPG you are and Demiplane suggests sessions and campaigns based on those preferences. For players who are worn out by min-maxing and want a chance to do some role-playing, this is a great way to find matches. The don’t host the games—the DM picks the platform—but they list games from tons of systems.