Not sure if it's top 3, but I use Monica https://www.monicahq.com/ which does advertise itself as a personal CRM. I certainly underutilize its features but things like birthday reminders + a place for a few notes (where do they live again? who's their partner?) is nice

I just put that stuff into obsidian here. Only thing I miss are the birthday reminders but there's probably a plugin for that :)