Slack advanced chat board (free, some limitations apply)
RocketChat advanced chat board (free if self-hosted, open-source)
MatterMost advanced chat board (free if self-hosted, open-source)
Slack advanced chat board (free, some limitations apply)
RocketChat advanced chat board (free if self-hosted, open-source)
MatterMost advanced chat board (free if self-hosted, open-source)