Thunderbucket - Quick fire ideas for advertising and marketing.
Validated ideas - List of 5,000 poorly executed but popular apps
PDFCrowd - Pdfcrowd is a Web/HTML to PDF online service. Convert HTML to PDF online in the browser or in your PHP, Python, Ruby, .NET, Java apps via the REST API.
IdeasAI - OpenAI-powered startup idea generator
Business Model Patterns Card Deck - Transform your business strategy
The 25 Days of Ideas - Free resources for coming up with startup ideas