Comwave Alternatives

tomeko.net/software: SIP client for Windows.

White-label VoIP Softphone with WebRTC and Auto-provisioning

VoIPstudio is an award-winning VoIP system that offers businesses of all sizes a scalable communication solution. It’s inexpensive, easy-to-use, offers a full suite of PBX features, and is fully integrated for CRM.

Try for free paid Free Trial $4.99 / Monthly (User)

PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP).

Empower Creation and Ensure Brand Consistency. Build and Share libraries of visual assets with your entire team — all from your desktop.

Open Source

Application and Data, Collaboration, and Web and Video Conferencing

Open Source

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.

Softphone for VoIP, CAPI und TAPI.

VoIP and video calling, messaging and presence - all from your computer desktop with the award-winning Bria 5 softphone client.

WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.

free

SessionTalk Desktop Softphone is a feature rich SIP Client for Windows devices with Video, Messaging, Push Notifications, Encryption, Dial Plan, Call Transfer and Call Recording.

Desktop client for Google Hangouts

International calls from your mobile, landline or computer.

Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.

Open Source