Spika is described as 'The world's first open source mobile messenger solution. This solution includes an iOS App, an Android App, and a server backend with an admin panel' and is a instant messenger in the social & communications category. There are four alternatives to Spika for a variety of platforms, including Windows, Android, Android Tablet, Self-Hosted and F-Droid apps. The best Spika alternative is Zulip. It's not free, so if you're looking for a free alternative, you could try Zulip or Mesh.
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.
Technitium Mesh is a secure, anonymous, peer-to-peer (p2p), open source instant messenger designed to provide end-to-end encryption. Primary aim of developing this instant messenger is to provide privacy which is achieved using cryptography and anonymity using Tor network.
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