libsignal
libsignal is a set of building blocks that handle secure messaging and encryption, used inside Signal's own apps and servers. It is aimed at programmers who build or maintain Signal's software, and the project itself says outside use is unsupported.
How hard it is to start using it. Easy: install it like a normal app, or use it in your browser. Advanced: you run it on your own server, use the command line, or it is a tool for developers.
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The project has not said how it feels about AI-written contributions. Maintainers can set this by claiming the listing.