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OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.
Xodo - Try easy-to-use PDF tools that keep your documents safe. Work with your important files across all platforms and devices with the ultimate all-in-one document solution. Your productivity lives at Xodo!
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Flexcil Inc. - View PDF documents, annotate them, and take notes without struggle on your tablet devices
Laverna - Laverna is a JavaScript note taking application with Markdown editor and encryption support.
Casedo - A document collection, management, navigation, markup and search app for lawyers and investigators.