Sent – A unified API for sending messages across SMS, RCS, and apps like WhatsApp.

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Open Source Encrypted Communication Tools using OpenTelemetry

A curated collection of the best open source communication tools that use end-to-end encryption. using OpenTelemetry.

Fluxer

Open source messaging with privacy and community focus

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Free, open-source instant messaging and VoIP platform with full Markdown support, voice/video calls, moderation tools, and self-hosting options for communities.

Open Source Alternative to:

Discord

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