The best open source alternative to BeejiveIM is Zulip. It's not free, so if you're looking for a free alternative, you could try Zulip or Conversations. If that doesn't suit you, our users have ranked more than 25 alternatives to BeejiveIM and seven of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to BeejiveIM are Xabber, Tinode, aTalk and Zom.
Threaded group conversations combine live and asynchronous messaging, separating topics for organized collaboration, supporting open-source, cloud, and self-hosted deployments, secure communication with encryption, and multi-platform access for diverse teams.
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].
An alternative Telegram client based on TDLib, with higher speed, slicker animations and experimental features.
Fully open source instant messaging server and clients. No proprietary components or non-free dependencies. Backend in pure Go (GPL 3.0), with a command-line administration tool in python + gRPC. Clients for Android, iPhone, and Web - ReactJS (all licensed under Apache 2.0).
Zom's security and privacy features are powered by the amazing foundation created by the ChatSecure project, and works with other great apps like Conversations.
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