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.

Documents by Readdle - A central hub for all your files.

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.

GoodReader - With GoodReader on your iPhone, iPod Touch or iPad, you can read virtually anything, anywhere.

Laverna - Laverna is a JavaScript note taking application with Markdown editor and encryption support.

FileApp - FileApp is an iPhone and iPad File System and Document Viewer.