Astian Spika Alternatives

tomeko.net/software: SIP client for Windows.

White-label VoIP Softphone with WebRTC and Auto-provisioning

RealityMAX is the most powerful free 3D design collaboration platform, 100% online. Cooperate remotely with your colleagues on 3D projects and easily share your work with clients. Create Web3D and AR experiences in a snap, without a line of code.

Visit website freemium $40.0 / Monthly (Pro with up to 500 GB of storage space)

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

Softphone for VoIP, CAPI und TAPI.

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.

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

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

Open Source

International calls from your mobile, landline or computer.