EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
GTDNext - About Us.
Wondershare PDFelement - All-in-one PDF editor