Tools for collaboration on documents:
http://drive.google.com Google Docs
http://www.mediawiki.org/wiki/MediaWiki
http://sync.in/
http://www.zoho.com/
Tools for marking up comments and sharing files:
http://www.bounceapp.com/
http://cageapp.com
http://www.conceptshare.com/
http://dribbble.com
http://www.framebench.com/
http://intuitionhq.com
https://beta.mural.ly/
http://www.marqueed.com/
http://noteboxapp.com
http://notableapp.com
http://proofhq.com
http://prevue.it
http://recurseapp.com
http://skitch.com
http://syncpadapp.com
http://www.textflow.com/
Tools for web site markup and critique:
http://www.conceptfeedback.com/
http://critiquethesite.com/
http://fivesecondtest.com/
http://www.pleasecritiqueme.com/
Tools for social usability testing web sites:
http://feedbackarmy.com/
http://www.usertesting.com/
https://usabilla.com/
Tools for Paper Prototyping - Mock ups - Wireframes:
http://invisionapp.com/
http://www.infragistics.com/products/indigo-studio/
http://www.microsoft.com/silverlight/sketchflow/
http://www.storyboardthat.com/
http://www.balsamiq.com/
Online Whiteboards:
http://www.scribblar.com/
Mind Mapping Online:
http://www.mindmeister.com/
Online Screen Sharing:
http://www.google.com/+/learnmore/hangouts/
https://join.me/
Group Task Management:
http://asana.com/
http://basecamp.com/
http://leankit.com/
http://www.mindjet.com/
http://www.producteev.com/
https://seenowdo.com/
http://teambox.com/
https://trello.com/
Social Media Management Tools:
http://hootsuite.com/
http://mediafunnel.com/
Enterprise Social Networks:
http://campfirenow.com/
http://www.huddle.com/
http://www.jivesoftware.com/social-business/platform/
https://www.yammer.com/
Data Visualization Tools:
https://developers.google.com/chart/
http://visual.ly/
Not on the list - add a comment with your favorite tool for collaboration.
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