Idea Validator - A customer development tool to help you validate your ideas before building them.
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Burner Page - Validate ideas with burner pages in < 60 seconds
Zapier - Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.
pttrns - iPhone and iPad user interface patterns
n8n.io - Free and open fair-code licensed node based Workflow Automation Tool. Easily automate tasks across different services.