Validated ideas - List of 5,000 poorly executed but popular apps
Milanote - Milanote is a note taking app for creative work.
Big Ideah - Evaluate your SaaS business ideas
snipnote - Organize your day with tasks, notes & checklists
Burner Page - Validate ideas with burner pages in < 60 seconds
Walling for Windows - Visual walls for your ideas and projects. Now on Windows.