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Signal – an ethical replacement for WhatsApp
(greenstarsproject.org)
This is a most excellent place for technology news and articles.
I don't use Signal because they don't release the app in F-Droid. Signal devs refuse to release the app outside of Google Play Store, which is very evil.
You can use Molly from F-Droid. They even have a full FOSS version that you can set up a self hosted notification socket for, to avoid Google Firebase.
You can download the APK once from the website, after that it updates automatically. https://signal.org/android/apk/
I know I can. But the hostility of Signal devs to open source and F-Droid makes me uncomfortable. Why use an app with such hostility?