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Mattermost supports CommonMark Markdown: https://docs.mattermost.com/help/messaging/formatting-text.h...

Zulip supports ~CommonMark Markdown: https://zulip.readthedocs.io/en/latest/subsystems/markdown.h...

Reddit supports Markdown. https://www.reddit.com/wiki/markdown

Discourse now supports CommonMark Markdown.

GitHub, BitBucket, GitLab and Gogs/Gitea support Markdown.

I wouldn't consider Discourse/Reddit/Github/etc. to be a messaging app per se, even if some of those have messaging functionality between users...

I digress on the category definition. Public messaging (without PM or DM features) is still messaging; and often far more useful than trying to forward 1:1 messages in order to bring additional participants onboard.

It's worth noting that GH/BB/GL have all foregone PM features; probably for the better in terms of productivity: messaging @all is likely more productive.

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