Validated ideas - List of 5,000 poorly executed but popular apps
NicheGenerator.nyz - A funny solution to start with people, not ideas or products.
Big Ideah - Evaluate your SaaS business ideas
Idea Crunch - Successful business ideas not yet launched in your country
Burner Page - Validate ideas with burner pages in < 60 seconds
Pain In My Butt - Crowdsourced business ideas