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Chat was the first thing to follow after the creation of the email protocols and clients.
Originally there was IRC and then that expanded.
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- There is now [IRC OFTC ](https://www.oftc.net/WebChat/ ) (The Open and Free Technology Community) as well, aka WebChat
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- [Linen.dev ](https://www.linen.dev ) is an interesting alternative to chat which incorporates both Discord and Slack messages and also has [forum ](https://www.linen.dev/s/linen/c/blog ) features.
- [Slack ](https://slack.com )
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- Discord
- Google Hangouts
- Whatsapp/Facebook messenger
- Apple iMessage
- SMS for texting
- Signal
- Telegram
- Line
Forums:
- Zulip
- Discourse
- Quora
- Lemmy
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