IdeasAI - OpenAI-powered startup idea generator
Idea Hunt - Solve specific challenges for your favorite products
Validated ideas - List of 5,000 poorly executed but popular apps
'X for Y' Idea Generator - Pitch a startup idea in 60 seconds
Ideas Grab - A list of +3400 ideas that you can get for your projects.
The 25 Days of Ideas - Free resources for coming up with startup ideas