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MockServer - Easy mocking of any system you integrate with via HTTP or HTTPS.
MockAPI - MockAPI lets users mock up APIs, generate custom data, and perform operations on it using RESTful interface.
Beeceptor - Unblock yourself from API dependencies, and build & integrate with APIs fast. Beeceptor helps you build a mock Rest API in a few seconds.
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
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.
WireMock Cloud - Fast and simple API mocking in the cloud, powered by WireMock.