ProductHunt is a well known place where people post product ideas to get feedback. It is very active. By the way, it itself is a startup that recently got millions in funding.
Brandeis Student Projects is a list that I maintain of projects done by my students over the years. Your products will also be added to this list!
Indie Hackers is another list of product and business ideas. Not as maintstream as Product Hunt but quite intersting!
Pitos Product List is a list that I keep with ideas of mine that I’ve shown to everyone taking my courses. Some of them are good, some are bad, some have been tried others have not. Feel free to use any of them.
Previous semester’s pilot project visions: P2PTours - Brief, Magic Travel Book Brief, Student Buying Club Brief, Bodega 2.0.