Also called "social software," collaboration software eliminates sending files back and forth via email or a copy service such as Dropbox or Box in order that multiple users can participate.

Noteflight and Flat.io are both examples of web-based notation software that encourage collaboration. You can invite other users to view your file and make real time changes and comments.

Enter IBM Lotus and its LotusLive Engage product, a Web-based collaboration tool that combines elements of the Lotus product line with IBM's emerging technical expertise in turnkey mash-up technology.

Noteflight and Flat.io are both examples of web-based notation software that encourage collaboration. You can invite other users to view your file and make real time changes and comments.