Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.

Beeceptor - Unblock yourself from API dependencies, and build & integrate with APIs fast. Beeceptor helps you build a mock Rest API in a few seconds.

Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.

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.

Strikethru - Strikethru is a kind of to-do list notebook for managing work lists and staying updated with the important tasks.

MockServer - Easy mocking of any system you integrate with via HTTP or HTTPS.