A brief note: The new version of nodeStorage, v0.78, is out.
This is the first version with Slack-like webhooks.
I have been able to use my existing Slack webhook code with this, both of which run unmodified with this server. So to that extent this is a clone, but I'm not claiming that at this time. They work like Slack, a subset of Slack's capabilities, and are not complete.
You can see the results of my testing in this liveblog post.