Loom - Loom is a screen recording extension for Chrome that gives people the ability to create and share media. Create your own videos using your camera, screen view, and audio. Read more about Loom.
Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
Studio1 - Automate your screencast videos for customer support.
PhonerLite - PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP).
Screencastify - Free screen recorder extension for Chrome. Capture, edit and share screencasts. No software download required. Works on Mac, Windows and Chromebooks. Screen RecorderFree screen recorder for Chrome.
tSIP - tomeko.net/software: SIP client for Windows.