Zulip is described as 'Threaded group chat with topics for live or async collaboration, open-source, supporting self-hosted or cloud use, suited for organized team discussions' and is a very popular instant messenger in the social & communications category. There are more than 100 alternatives to Zulip for a variety of platforms, including Android, iPhone, Web-based, Windows and Mac apps. The best Zulip alternative is Signal, which is both free and Open Source. Other great apps like Zulip are Telegram, Element, Discord and Matrix.
Branded platform combining customizable community spaces, event scheduling, course management with video hosting, interactive discussions, AI moderation, member directories, gamified engagement, payment processing, advanced analytics, and automated notifications.
Team communication without the noise and distraction of instant messaging. Messages are sent on a fixed two hour schedule, giving plenty of time to get into deep work and flow.
signal-cli is a commandline interface for the Signal messenger. It supports registering, verifying, sending and receiving messages. signal-cli uses a patched libsignal-service-java, extracted from the Signal-Android source code.
BBM Enterprise enterprise messenger offers faster communication, collaboration and decision making while providing enhanced security over corporate data.
Offers free global video and voice calling, group chat with up to 50 participants, in-app messaging that bypasses SMS plans, music clip sharing via Spotify, photo editing, gaming and gifts, animated messages, mini-games during calls, and centralized media gallery.
Communication without limits. The modern chat platform with servers, channels, direct messages and passwordless magic login.
Allows users to connect using either text or webcam for video conferencing. Reliable chat room open all day and night allowing people to connect online.
Turn your phone into a Walkie Talkie.
Don't waste time on phone calls and voicemails.
Voxer is a Walkie Talkie app for smartphones. Send instant Audio, Text, Photo and Location messages to one friend or a group of your friends. Your friends can listen to your message while.
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.
Instant messaging with voice and video options, live group video chat for up to 10 participants, public and private rooms, interest communities, mobile and desktop access, user-created rooms, moderation tools, and options for anonymous participation.
Tkabber is a Free and Open Source client for the Jabber instant messaging system. Its writen in Tcl/Tk, and works on many platforms (tested on Linux, FreeBSD, NetBSD, Solaris, MacOS X and Windows 98/2000/XP).
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