Fossify Messenger is your trusted messaging companion, designed to enhance your messaging experience in various ways.



Smoke Crypto Messenger is described as 'Smoke Messenger is an open-source Instant Messenger that is known as the first mobile Messenger worlwide using the encryption algorithm McEliece. To be downloaded at F-Droid.org or Github.com. Smoke provides with its own Server-Software: SmokeStack-Echo-Server' and is a instant messenger in the social & communications category. There are more than 50 alternatives to Smoke Crypto Messenger for a variety of platforms, including Android, iPhone, Mac, Windows and iPad apps. The best Smoke Crypto Messenger alternative is Signal, which is both free and Open Source. Other great apps like Smoke Crypto Messenger are Telegram, Element, Matrix and Tox.
Fossify Messenger is your trusted messaging companion, designed to enhance your messaging experience in various ways.



Threema is a new mobile messaging app that puts security first. With true end-to-end encryption, you can rest assured that only you and the intended recipient can read your messages.



Threema is the most popular commercial alternative to Smoke Crypto Messenger.
Zulip is the only modern team chat app that is designed for both live and asynchronous conversations. Zulip topics create a separate space for each discussion, so different conversations will never get in each other's way.




RetroShare is a open source cross-platform, private and secure decentralized communication system. It lets you to securely chat, share photos, videos, and more, using OpenPGP to authenticate peers and .




It is the brand new, and fastest ever, Matrix client. It is for personal and community use, and will support enterprise functionality later this year.



Offers secure messaging with end-to-end encryption, unlimited free calls, group chats for up to 250 members, rich media sharing, emoji reactions, AR lenses, self-destruct messages, affordable international calls, community channels, and robust privacy across devices.



FluffyChat is an open, nonprofit and cute matrix messenger app for Ubuntu Touch, Android and iOS.



Keybase is a new and free security app for mobile phones and computers. For the geeks among us: it's open source and powered by public-key cryptography.



Delta Chat looks and feels like other popular messenger apps, but does not involve centralized control, tracking or selling you, friends, colleagues or family out to large organizations. "Privacy by Design" has never been more fun.




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].




Linphone is one of the most famous open source softphones in the world. It is fully SIP-based, for all calling, presence and IM features.



