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

Proof.ink - Proven immutable data stored on the Steem blockchain

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

Quick Freeze - Move faster by skipping the setup and management of local databases and direct integrations.

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

HeyForm - Paperless data collection with better data insights