
Description: Zoiper is a softphone application for making VoIP calls over the internet. It supports popular protocols like SIP, IAX, and H.323. Zoiper provides high quality audio/video calls, instant messaging, presence management and other communication features.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: X-Lite is a free softphone application that enables VoIP audio and video calls over the internet. It supports common calling features like call waiting, call transfer, and conference calls. X-Lite is cross-platform and works on Windows, Mac, and Linux.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API