@7thking, I built a site that display games posted the forum in a gallery view. It has an all-time view (based on forum like counts): https://games-gallery.jacobcarpenter.com/all-time. Definitely some gems in there, but not a definitive list of the actual best games.
For the game jams, @hassan’s link is a good start. Each Jam also has their own page with some write-ups for the winners:
Note that the gallery only shows the first-posted versions of games, so it may be worth checking the forum links for newer updates. For example (shameless self promotion), the latest versions of Space Rocks 3D and Boulders and Gems have a lot more features and bugfixes compared to the initial ones.