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You can use Signal without Android or iOS by registering your phone number using signal-cli:
https://ctrl.alt.coop/en/post/signal-without-a-smartphone/
@be Still down for me.
@be It's good to mention that there also is a #Signal Web Gateway that can be use for bots, notifications or 2FA (with #nextcloud for example).
https://morph027.gitlab.io/signal-web-gateway/