CryptPad Kanban is the ideal way to organise tasks, track project progress, ...
Kanban is developed from scratch by the CryptPad team
Whether following an Agile methodology, kanbans are great for sorting and oganizing tasks when collaborating. Easily keep track on the whole team status
Full blown markdown editor, add lists, text formatting, even images
Other apps:
Diagram Form Markdown Markdown Slides Rich Text Sheet Whiteboard