Direct messaging comparison
- + existing userbase
- + end-to-end encryption
- - owned by facebook
Signal
- identical to whatsapp
- no existing userbase
- cmdline client available on github
- open source
- end-2-end encrypted
Telegram
- Hosted in russia
- has native support for bots
Matrix.org
- Self hosted
- Distributed
- open source
- various clients inc iOS android cmline
Slack
- externally hosted
- electron based linux/OSx client
- integration with github a.o.
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