The Freeplane add-on that syncs a GTD mind map with a todo.txt file
The Freeplane add-on "GTD Sync" enables you to use the non-linear representation of Freeplane to organise and review your projects, next actions and delegated actions. You can then use a todo.txt list manager like Simpletask for Android to decide on the go what to do in a certain context and to check off completed tasks
The add-on imports new next or delegated actions and changes to existing next or delegated actions from the todo.txt file into the GTD mind map and then exports all next actions to the todo.txt file. ...
Apps notes for Windows, iOS and Android, with direct local sync
Apps notes for Windows, iOS and Android, with direct local sync. The server is a Windows application so you need to run it for sync.
If you want to leave the old date when editing a note then on mobile phones you need to click on the date and on the PC hold down the "Shift" key when you click on the done button.
How to install and other things - https://github.com/r57zone/EasyNotes