YakYak Alternatives

tomeko.net/software: SIP client for Windows.

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

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)

Open-source video calling and chat platform.

Application and Data, Collaboration, and Web and Video Conferencing

Open Source

White-label VoIP Softphone with WebRTC and Auto-provisioning

Softphone for VoIP, CAPI und TAPI.

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

Linphone is an internet phone or Voice Over IP phone (VoIP).

Open Source

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

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

Open Source

MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack.

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

Comwave is a state-of-the-art communication service and rich solution providing a platform that is designed for modern businesses to streamline their growth with an agile approach.