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Focalboard is (too) simple, free, open-source and self-hosted. See More
HuBoard presently states that they integrate with Gitter, Slack and HipChat; they provide a general "Outgoing Webhooks" capability and are working on a general-purpose API. As an open-source app, they leverage both paid and donated contributors to the product hosted as their service. See More
They have an integration listed as "in beta" as of June 2015 that integrates with the Rally ALM system. No integration with Slack, Gitter, etc; no provisions for general webhooks to notify of events. If it can't be expressed within their GitHub integration, it doesn't exist. Their FAQ makes a fairly explicit pitch to upsell Rally ALM that you may or may not find distasteful. See More