IdeasAI - OpenAI-powered startup idea generator
Validated ideas - List of 5,000 poorly executed but popular apps
'X for Y' Idea Generator - Pitch a startup idea in 60 seconds
The 25 Days of Ideas - Free resources for coming up with startup ideas
Generating Product Ideas - Find ideas for your next business or side project
AreYouInterested - A super-simple landing page builder for bulk idea validation