OneNote is fast, has many features, works on every platform, and synchronizes notes across all devices, for free. Export to PDF, work offline, format text, and link notes.

A cross-platform, crazy fast, "open" app with a good looking UI, linking of notes, graph view, inline images, cool bookmarking, templates and a lot more. But is it a note-taking app?

Autosync is one of my new favorite Android apps. It's not a note taking app but rather an app that can be used to synchronize note files across devices – through one of many cloud services – for a low, one time fee. I  heard about this incredible file/folder synchronization app