The footer link has been updated. Thanks! 
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What about element?(formally riot.im) Sorry to throw another service into the mix.
Its free in both senses. Some people prefer OSS so slack may be a barrier. We can host it in matrix.org so no cost or maintenance.
IRC, it doesn’t delete post history like slack.
It also has apps available on all platforms, web, desktop & mobile.
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I like element and there is a crystal channel there is you want to join us.
https://matrix.to/#/!cdgzflbMCezhXeFNnk:matrix.org?via=matrix.org&via=mozilla.org&via=dmnd.sh
hi guys, please, I am actively learning crystal. and I want to create a community in Colombia, therefore, I would like to be in the slack group. Can you send me the invitation to stivenson.rpm@gmail.com?
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A slack invitation link was already posted in this thread Suggestion for growing the community around Crystal
I’m not sure the Slack workspace is actively used, though. You can find other community chat platforms at https://crystal-lang.org/community/#chat
I know IRC and Gitter are regularly frequented.
The link is no longer active.
Here’s a new link: https://join.slack.com/t/crystallang/shared_invite/zt-jyrbz99v-6KGYLAJLab~D5hR1wxL9sQ
Do note that that Slack is kind of abandoned: it had no activity in the past months at all.
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So I think it is better to not refer to it anymore and close for not scattering the community around.
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As said in this post, Gitter, Matrix, IRC and bridges, having bridges between Slack, Discord, Gitter and Matrix is an option. This can satisfy most of us, by allowing to use our preferred chat.
It is already very possible to use Matrix to access our existing communication channels (but further bridging is not viable at the moment).
If someone was disgruntled by the UI of either IRC or Gitter, there you go.
And I’ll still just repeat: please 
don’t fragment the community
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Sorry, corrected link:
Access the existing Gitter channel through Matrix:
Sure, that’s the point, the main deal is bridging the (popular?) Discord and Gitter/IRC channels. They both already exist.
For Slack, it was a suggestion, for @asterite and maybe others 
. I don’t create the Slack channel, it also already exists.
hi, thank you very much for the link… i’ll check slack and discord
Al teast this forum is quite alive and can be used as a chat, so let stick to it then ;)
I think Discord is a much better experience than Slack. The way Slack requires a separate account for each group you join is a pain.
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I did an investigation a couple of month ago, to me Zulip came out best because of it’s threading, I think this is a big advantage!
I looked at Slack, Mattermost, Zulip, Riot/Matrix/Synapse, Rocket.chat and Wire
I don’t know about threading in a chat app. My experience with threading in Teams is that a lot of people can’t figure out how to use it correctly which leads to a mess where conversations are spread across multiple threads.