Speek! is described as 'The first messenger that onymous and censorship-resistant by design. Speek! messenger encrypts all messages and is secure, private and decentralized' and is a instant messenger in the social & communications category. There are more than 50 alternatives to Speek! for a variety of platforms, including Android, Windows, iPhone, Mac and Linux apps. The best Speek! alternative is Signal, which is both free and Open Source. Other great apps like Speek! are Telegram, Element, Matrix and Tox.
The goal of Gajim is to provide a full featured and easy to use XMPP client. Gajim works nicely with GNOME, but does not require it to run. It is released under the GNU General Public License.
Kosmi is a free real time application and communication platform that offers voice, text and video calls along with games and applications such as SNES Party, NES Party, OpenArena, Poker, Virtual Cardtables, Synced YouTube and Cowatch Video.
WeChat is a complete mobile communication and private social networking app. Free, cross-platform, and full-featured, WeChat is the best way to keep in touch with everyone you care about.
ChatSecure is a free and open source messaging app that features OTR encryption over XMPP. You can connect to your existing accounts on Facebook or Google, create new accounts on public XMPP servers(including via Tor), or even connect to your own server for extra security.
Session is the world's first open-source, decentralised private messenger to use industry-leading Signal Protocol encryption — without asking for your phone number.
Bitmessage is a P2P communications protocol used to send encrypted messages to another person or to many subscribers. It is decentralized and trustless, meaning that you need-not inherently trust any entities like root certificate authorities.
qTox - The most feature-rich Tox client; P2P instant messaging, audio and video calls.
Imo is a free, simple,secure and faster international video call & instant messaging app.
A playful and interactive multimedia messaging app offering ephemeral photo and video sharing. Control view time, get alerts for screenshots, and engage with friends through gamified interactions and video calls.
Android keyboard for secure E2EE communication through the signal protocol in any messenger. Communicate securely and independent, regardless of the legal situation or whether messengers use E2EE.
Protect your communication in transit and on your phone. Silence (formerly SMSSecure) is a full replacement for the default text messaging application: all messages are encrypted locally and messages to other Silence users are encrypted over the air.
Utopia P2P Ecosystem. Utopia is a feature-rich platform that is specifically designed to protect privacy of communication, confidentiality, and security of personal data. Utopia is a decentralized network, with no central server involved in data transmission or storage.
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