VoIP.ms - VoIP.ms is a VoIP origination and termination tool.
CloudTalk - Work locally, grow globally
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
Webinato - Webinato is a platform for webinar automation.
Loop Communications - Loop Communications provides hosted VoIP business phone systems to small businesses and mid-sized companies.
CSipSimple - CSipSimple is a SIP application for android devices.