MockServer - Easy mocking of any system you integrate with via HTTP or HTTPS.
Clerk Chat - SMS for Slack
Beeceptor - Unblock yourself from API dependencies, and build & integrate with APIs fast. Beeceptor helps you build a mock Rest API in a few seconds.
Codeimg.io - Create and share images of your source code
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.
Ray.so - Create beautiful images of your code