CounterPath Bria is recommended for businesses of all sizes that need a reliable and feature-rich communication tool. It is also suitable for remote teams, freelancers, and individual users who require a dependable VoIP service for professional and personal use, offering flexibility and ease of use across multiple devices.
Tragofone - White-label VoIP Softphone App with WebRTC and Auto-provisioning
PhonerLite - PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP).
tSIP - tomeko.net/software: SIP client for Windows.
Jami - Application and Data, Collaboration, and Web and Video Conferencing
Astian Spika - Astian Spika is an instant messaging service focused on speed, security and productivity. With great differences such as integration with Astian Cloud, support for video calls, calls among other features.
Phoner - Softphone for VoIP, CAPI und TAPI.