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Signal on Linux
(lemmy.today)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
Flatpaks are pretty easy to read through. Just go to the links section of Flathub and click the manifest, then read it to see what is done during building.