Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
Xcode - Xcode is Apple’s powerful integrated development environment for creating great apps for Mac, iPhone, and iPad. Xcode 4 includes the Xcode IDE, instruments, iOS Simulator, and the latest Mac OS X and iOS SDKs.
tSIP - tomeko.net/software: SIP client for Windows.
Android Studio - Android development environment based on IntelliJ IDEA
PhonerLite - PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP).
Ant Design React - Ant Design is a React UI library that provides a wide range of top-notch demos and components for creating high-profile, interactive User Interfaces without hassle.