The Classic Movies idea is kind of like: https://www.locserendipity.com/Film.html

It randomly shows a list of film entries on Wikipedia to expose you to a broader variety of movies.

Also Books: https://www.locserendipity.com/Books.html

And old songs: https://www.locserendipity.com/LP.html

Nice list!

Ideas I liked:

* RichMeet: PMs at zoom and gmeet take notes, shouldn't be too hard to add some ML features

* TechMap: Linkedin PMs take notes

* SocialGravity: there are some tools like map of subreddits

* CompetitorWatch: surely it's built already?