Actually a clone wouldn't help much, because Slack itself is not really that great, even when it is up. There are better alternatives, which do not cause high C

Actually a clone wouldn't help much, because Slack itself is not really that great, even when it is up. There are better alternatives, which do not cause high CPU load every time one switches a channel, render Markdown properly (seriously, what is it with all the "enterprise service providers" being unable to use a decent markdown parser!?) and have have better integration with other open source tools.