Laverna is a JavaScript note taking application with Markdown editor and encryption support.

StackEdit is a full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.

Hemingway Editor is a proofreading tool for writers.

TiddlyWiki is an open-source single page application wiki in the form of a single HTML file that includes CSS, JavaScript, and the content.

Checkvist helps you create and share online outlines, project plans, online checklists, and task lists.

Journey is a journal app companion that keeps your private memories for a lifetime.