Cross-platform hierarchical note taking application with focus on building large personal knowledge bases.

This is a port of the desktop application TriliumNext Notes. These features of the original are implemented:

Synchronisation with sync server / desktop app
Notes can be arranged into arbitrarily deep tree, where single notes can be placed into multiple places in the tree
WYSIWYG note editor based on CKEditor
Fast and easy navigation between notes
Automatic note versioning
Note attributes