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I'd do it, but keep the references to Slack to a minimum. So, don't call it "OpenSlack", for example. Just give it a nice name, mention that it's Slack API compatible and you should be fine. At most, I suspect they'll just C&D you and then you say sorry and take it down. I can't imagine you'll get in any trouble.

Not a lawyer though.

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I'd agree with that except the part about mentioning Slack compatibility. I wouldn't mention Slack at all without their permission.

Since the OP says that this is for another project, they might get not only a C&D for the chat code, but the original project might be infringing as well. Even if it's not actually infringing, it might result in some legal fees.

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