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There's a Free and Open Source Alternative to Slack called Mattermost: http://www.mattermost.org/

Thanks for the mention! Mattermost team here, just to add, there's an option to use Mattermost as an IRC server via: https://github.com/42wim/matterircd

So if part of your team wants to stay on IRC and part wants to use Mattermost with file sharing and messaging across PC and phone, and integrate with Mattermost apps (http://www.mattermost.org/community-applications/) all that is available.

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