What is your favourite open source software that you discovered in the past year, that you can no longer live without?
Mine is Local Send which is a FOSS alternative similar to air drop that works across a variety of devices.
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I haven't used Signal.
Is your 'registered Signal number' your phone handset number?
From this page:
https://support.signal.org/hc/en-us/articles/360007318691-Register-a-phone-number
[You are right, Delta Chat uses AutoCrypt, which is OpenPGP based.]