Linphone is described as 'Is one of the most famous open source softphones in the world. It is fully SIP-based, for all calling, presence and IM features' and is a very popular instant messenger in the social & communications category. There are more than 50 alternatives to Linphone for a variety of platforms, including Android, iPhone, Windows, Mac and iPad apps. The best Linphone alternative is SimpleX Chat, which is both free and Open Source. Other great apps like Linphone are Jami, Jitsi Desktop, Molly and FluffyChat.
MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack. It allowing to do high quality VoIP calls (P2P or on regular telephones) via open SIP protocol. From cloud of SIP providers you can choose best for you, register account and use it with MicroSIP. You'.
France
EU
EstoniaEU
Speek! is the first messenger that is anonymous and censorship-resistant by design. Speek! messenger encrypts all messages and is secure, private and decentralized.
Chat with anyone on X in a private, focused space built for conversation. No ads. No tracking. Fully end-to-end encrypted.
United States
Zoiper IAX & SIP multilanguage and multiplatform (Windows, Linux and Mac OS X) softphone is a VoIP soft client, meant to work with any IP-based communications systems and infrastructure.
BulgariaEU
A fork of Signal for Android with proprietary Google binary blobs removed. Uses OpenStreetMap for maps and a websocket server connection, instead of Google Maps and Firebase Cloud Messaging.
TeleGuard is the data-secure messenger from Swisscows. TeleGuard encrypts every message and all telephone calls with encryption algorithm currently available: SALSA 20. TeleGuard servers are located in Switzerland, they are not subject to the data protection laws of the EU /...
Switzerland
QuteCom is a community of enthusiasts and developers, creating free software products related to communication over IP. The flagship product of the QuteCom project is a softphone which allows you to make free PC to PC video and voice calls, and to integrate all your IM contacts...
FranceEU
This project won the first prize 🥇 at Telegram Lightweight Client Contest and now is an official Telegram client available to anyone at web.telegram.org/a.
Thoughtfully designed, Bria leverages over 10 years of softphone experience in improving productivity for our customers.
Canada
Sphinx.chat lets you use your lightning node to talk to anyone else who is running lightning and a sphinx compatible chat client.
