Ushahidi - Ushahidi gathers data from various sources and reports incidences around the world in real time.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
360social - 360social is a browser plugin that shows the social footprint of the people you want to connect with right inside your browser.
Live Chat by Sumo.com - Instantly communicate with customers, prospects & visitors
AwesomeHunt - Community-curated lists of learning resources on any topic.
GoSquared Live Chat - Beautiful, simple, and free live chat for your website