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.
Kalam Labs - Twitch for Science
Wondershare PDFelement - All-in-one PDF editor
RunaWFE - RunaWFE Free is a free Open Source BPMS (business process management system), which serves to optimize and automate business processes (for Windows, Linux, Mac OS).
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
Litnerd - The Pixar for education, reading program for K-5 schools