Open source alternatives to WhatsApp
If you don’t want to use Facebook’s WhatsApp and you are looking for an open-source messaging app, these are some popular options.
Note: some options have open-source clients but proprietary server software; others have open-source client and server software.
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Signal is known for being Edward Snowden’s application of choice and for showing up on Rami Malek’s “Mr. Robot”. It offers end-to-end encryption, no ads, no trackers and it’s managed by an independent non-profit organization.
Although Telegram official Android app has some proprietary software, there are several 100% open-source forks, like Telegram FOSS. Telegram is mainly used for group messaging, but it has all the features of a private messaging app: end-to-end encryption, access from several devices (there are companion apps for Windows/macOS/Linux).
End-to-end encryption, no ads and no trackers, no phone number needed, onion routing, open source. A truly private messaging app. You can download it from Google Play, F-Droid (by adding a repository), GitHub and App Store.