Something that combines the features of the mmdb (list of Mods by Sokominetherein) and my experimental game list on the Minetest Wiki would be great. It should provide categories or tags and be sortable.
Although such a list would be huge and would need constant maintenance. I guess something automatic or at least semi-automatic as suggested elswhere would be best. Maybe something similar to Sfan5's Mod thread statistics script could do the job . . .