Freeplane add-on for task management and memo taking
Thinking notebook and Markdown editor
Mind map and outliner editor for Windows, Mac, Linux, Android and iOS
Workflowy inspired, simple outliner for Windows
Hierarchical notebook (Inspired by Cherrytree, with less features)
Linux outliner (cli)
Outliner and time organizer for todo lists, events or scheduling tasks
Create hyperlinks just by dragging, find contacts instantly, ...
Piggydb helps you have more fun with knowledge creation.
MindRaider is a personal notebook and outliner.