It’s not a big game, but I fell in love with Nefarious (specifically a translated version) after encountering it in the wild. Fast pace, simultaneous turns, short games, simple rules, no eliminations leading to people waiting for others to finish, and at the same time has some interesting decisions leading to multiple strategies… And then you add two twists every game, changing the rules, meaning you have to adapt your strategies, keeping it fresh.
That’s not exactly anti-FOSS, to my understanding, since the “free” part refers to freedom. As long as after you pay you are free to use the software as you want and get access to the source code, I think it might still count as FOSS? And then, of course, there’s the option of paid support on free (of charge) software, though I think recent events might suggest that’s not really sustainable.