Evernote

Evernote is an extensive notes service (with apps) that support different platforms, has been around for a long time

Free basic account

Link to a public shared NoteBook

Learn more:

Evernote is now integrated with Google Drive

6 apps you should be using with Evernote

Learn more about Evernote with these excellent video tutorials

The ultimate simplified guide to the use of Evernote in education