Trilium Notes is a hierarchical note-taking application with focus on building large personal knowledge bases.

Features:

• Rich WYSIWYG note editing including e.g. tables, images and math with markdown autoformat
• Support for editing notes with source code, including syntax highlighting
• Notes can be arranged into arbitrarily deep tree
• A single note can be placed into multiple places in the tree (see cloning)
• Fast and easy navigation between notes, full text search and note hoisting
• Seamless note versioning
• Note attributes can be used for note organization, querying and advanced scripting
• Synchronization with self-hosted sync server
• Sharing (publishing) notes to public internet
• Strong note encryption with per-note granularity
• Relation maps and link maps for visualizing notes and their relations
• Scales well in both usability and performance upwards of 100 000 notes
• Evernote and Markdown import & export
• Web Clipper for easy saving of web content
• REST API for automation