Upcall - Upcall enables you to crowdsource your outbound calls. Collaborate with 1000+ on-demand callers worldwide for sales, marketing and customer support calls. Free trial.
CloudTalk - Work locally, grow globally
Veloxy - A sales enablement app. Your calendar on steroids!
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs
Kit CRM - A CRM for your Facebook page
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.