Instant Expert
Instant Expert reviewedDropbox PaperCollaboration tool built for teams
 NeutralPros: 

Beautiful, Fast, Colaborative

Cons: 

Already Obsolete

Its a great tool for starters, For teams I do not recommend. there are lots of apps that do the same, even google docs is more intelligible when collaborating and working with. But we already have OneNote, Evernote, Word Online, with lots of features way ahead Paper.

Instant Expert has used this product for one month.