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.
Waydev - Waydev analyzes your codebase from Github, Gitlab, Azure DevOps & Bitbucket to help you bring out the best in your engineers work.
MockServer - Easy mocking of any system you integrate with via HTTP or HTTPS.
Screenful Metrics for GitHub - Analytics for GitHub Issues
Beeceptor - Unblock yourself from API dependencies, and build & integrate with APIs fast. Beeceptor helps you build a mock Rest API in a few seconds.
Git History - Quickly browse the history of any GitHub file Replace github.com with github.githistory.xyz in any file url.