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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.
gURL - gURL is a free, Open Source (GPL) HTTP request generator tool.
Beeceptor - Unblock yourself from API dependencies, and build & integrate with APIs fast. Beeceptor helps you build a mock Rest API in a few seconds.
Postman - The Collaboration Platform for API Development
MockServer - Easy mocking of any system you integrate with via HTTP or HTTPS.
Hurl.it - Hurl makes HTTP requests.