CherryTree is an hierarchical note taking application, featuring rich text and syntax highlighting, storing data in a single xml or sqlite file.

Evernote is a note taking application which keeps the notes taken in sync across all platforms using its cloud infrastructure.

Google Keep is a cloud based note taking application.

Joplin is an open-source free note taking and to-do application.

Nitro is free open source task management software.

Nozbe is a to-do, task, project and time management application.

CintaNotes is a freemium Microsoft Windows notetaking program.

Go For It is a simple and stylish productivity app, featuring a to-do list, merged with a timer that keeps your focus on the current task.

Google Tasks is the task list functionality provided by Google.

Microsoft OneNote is a digital note taking and sharing app from Microsoft.

Notezilla is a sticky notes app for Windows.

Omni Notes open-source note-taking application, designed to be lightweight and simple without giving up smart behavior.