Checkly - Fresh API monitoring and Site Transaction Monitoring. From one great dashboard.
Beeceptor - Unblock yourself from API dependencies, and build & integrate with APIs fast. Beeceptor helps you build a mock Rest API in a few seconds.
Listy Beta - The things you love, privately saved and beautifully listed
Webhook.site - Instantly generate a free, unique URL and email address to test, inspect, and automate (with a visual workflow editor and scripts) incoming HTTP requests and emails.
Checklist Generator - Create checklists for free and host them wherever you want.
MockServer - Easy mocking of any system you integrate with via HTTP or HTTPS.