Validated ideas - List of 5,000 poorly executed but popular apps
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
IdeasAI - OpenAI-powered startup idea generator
Facebook Local - Discover places to go and events happening near you
The 25 Days of Ideas - Free resources for coming up with startup ideas
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets