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.
Open-source messaging platform enabling private, identifier-free chats, encrypted group discussions, file and media sharing, plus audio and video calls. Employs double-ratchet protocol, stores user data on-device, protects metadata, and lets users self-host relay servers.
Jami (formerly GNU Ring, SFLphone) positions itself as a potential free Skype replacement
Jitsi Desktop (previously SIP Communicator) is a legacy audio/video and chat communicator with full encryption, precedessor of Jitsi Meet .
Encrypted messenger supporting multi-platform access, unlimited group and private chats, file and voice message sharing, decentralized operation, open-source code, custom themes including dark mode, advanced moderation, push notifications, and no advertisements.
Conversations is a privacy focused, open source XMPP Texting [Jabber] client for Android 4.0+ smart phones with wife-approved easy encryption [OTR, OMEMO, or GPG].
Provides comprehensive communication features including group video calls, voice calls, fast messaging, photo sharing, and location mapping. Access through mobile and web platforms with real-time notifications, ensuring seamless interactions using multimedia tools.
FaceTime is a video calling software feature developed by Apple for the iOS and Mac OS.
Empathy is a messaging program which supports text, voice, video chat, and file transfers over many different protocols. You can tell it about your accounts on all those services and do all your chatting within one application.
Status combines a private messenger, secure crypto wallet, and Ethereum Web3 DApp browser into one powerful communication tool. Chat with friends and growing communities. Buy, sell, store, and exchange digital assets.
Imo is a free, simple,secure and faster international video call & instant messaging app.
3CX is a software-based, open standards IP PBX that offers complete Unified Communications, out of the box.
Offers a free trial period, after with you need to upgrade to paid subscription.
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