Testlio - Testlio is a community of expert testers that help companies release their apps with highest confidence
Beeceptor - Unblock yourself from API dependencies, and build & integrate with APIs fast. Beeceptor helps you build a mock Rest API in a few seconds.
GoReplay - GoReplay is an open-source tool for capturing and replaying live HTTP traffic into a test environment.
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.
LogiGear - LogiGear provides software testing solutions including test tools, services, and training, and a defect tracking.
MockServer - Easy mocking of any system you integrate with via HTTP or HTTPS.