YateClient - YateClient is an Instant Messenger and a SoftPhone.
SmartWindows.app - Auto arrange all your app windows, whether on one screen or many with a single click!
Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
ReIcon - ReIcon is portable freeware that enables you to save and restore your desktop layout.
FreeSWITCH - FreeSWITCH is an open-source media application designed to support popular protools such as SIP and WebRTC and provides a platform to develop voice and video applications.
VC Starter Kit - Everything you need to look like a Venture Capitalist