Turtl lets you take notes, bookmark websites, and store documents for sensitive projects. From sharing passwords with your coworkers to tracking research on an article you're writing, Turtl keeps it all safe from everyone but you and those you share with. Developed by Lyon Bros. Enterprises, LLC
License: Open Source
Turtl is designed for secure note-taking with a focus on user-friendliness and cross-platform support, while Zim is a more powerful desktop application ideal for creating and managing wikis, but lacks mobile support.