ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Postman - The Collaboration Platform for API Development
Zapier - Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.
Amazon API Gateway - Create, publish, maintain, monitor, and secure APIs at any scale
n8n.io - Free and open fair-code licensed node based Workflow Automation Tool. Easily automate tasks across different services.
Apiary - Collaborative design, instant API mock, generated documentation, integrated code samples, debugging and automated testing