Collaboration

Collaborative Documentation
http://docs.google.com/
http://online.thinkfree.com/
http://www.zoho.com/
http://sync.in/
http://entri.co/
http://marker.to/
http://markup.io/
http://www.boomwriter.com/
http://substance.io/

Visual Collaboration
http://www.synchtube.com/
http://watch2gether.com/
http://channel.me/
http://www.wevideo.com/
http://webcamvideo.us/
http://www.anymeeting.com/
http://www.readytalk.com/
http://vyew.com/
http://quickscreenshare.com/
https://join.me/   -> Remote Video Conference and Collaboration
http://meetings.io/ Video Conference and Collaboration

Collaboration Management
https://www.pegby.com/
http://teambox.com/
http://www.enterthegroup.com/
http://wiggio.com/
https://andbang.com/

Collaborative Annotation
http://www.crocodoc.com/
http://a.nnotate.com/
http://www.pdfescape.com/
http://www.pdffiller.com/
http://www.bounceapp.com/   Web Annotation and Highlight
http://middlespot.com/  Web Annotation and Highlight
http://bit.ly/KB20Gw    Web Annotation and Highlight (Sticky Notes)
http://groupdocs.com/   Working on Documents faster and together
https://www.surdoc.com/ Online Document Backup and Store
http://sharedcopy.com/  Web Annotation, Collaboration and Highlight