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 iPad 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.
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.
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.
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.
Instantbird is an instant messaging client based on Mozilla XULRunner and the open source library libpurple created by the software developers of Pidgin . Over 250 add-ons allow user customization of, and addition of, features.
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.
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.
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.
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).
Self-hostable open-source chat solution offering text, voice, and video with fine-grained roles, forum threads, DM workspace, browser soundboard, custom emoji, PWA offline support, push notifications, analytics tools, and advanced moderation capabilities.
KeeperChat - The leading secure messaging app.
• Private vault for messages, photos and videos • Private, encrypted media gallery (nothing is saved on device’s camera roll) • Biometric login and self-destruct protection for vault • Message retraction and self-destruct timer • Tw.
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