[constantius]

You're right, Slack/Trello alt is what I view it as, but the Trello part was more relevant for me.

For anyone reading, Zulip (for Slack) and Wekan (for Trello) are good replacements.

I needed to switch an org away from Slack, seems like Zulip has a new customer :).

https://zulip.com/ https://wekan.github.io/