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Looks interesting, curious about the motivation for creating it and the differences / advantages over hubot? (other than the obvious different choice of language).

Perhaps I missed it, because there's plenty of documentation, which is great of course, but I somehow felt a bit overwhelmed with detail so couldn't really see the wood for the trees.

EDIT: a few key differences as far as I could spot (although not sure what's the most fundamental difference):

* plugins can be dynamically loaded (e.g. from a git url), even via the chat interface itself.

* more focus on security / permissions to administer (I'm guessing that's also partially connected to the dynamic nature of plugins, because without security it's very easy to mess things up)

* plugin eco-system seems a bit thin(?) could only find a strange list to github repos[1]

* built-in per-plugin persistence (not sure how it is actually stored though)

[1] https://github.com/gbin/err/blob/master/errbot/repos.py

To add to your list here are few slides I presented at the last chatops meetup in SFO about errbot with some more emphasis on plugin development: https://docs.google.com/presentation/d/1YnQaz5bMr5PJNYEJzjKm...
It's not just a chat bot. It's a framework for a chat bot.

(It seems to be a bit late to be doing IRC bots. Can you do 'bots on Kik?)

about the built-in per-plugin persistence: it is just python pickle based at the moment but there is some recent interest on abstracting it for other storage backends like redis (https://github.com/gbin/err/issues/478).
Very nice. I've been working on a Slack specific alternate to Hubot called Jeev. Although it's not 100% ready yet, and there are still some bugs. We use it on our company slack for quite a few things:

https://github.com/jhgg/jeev

Here's an example of one of the more intricate modules we've open sourced:

https://github.com/jhgg/jeev-jiracache

Guillaume, the author of Err, gave a presentation on it at the last ChatOps meetup in San Francisco: https://www.youtube.com/watch?v=R_HDq14oI8Q
For those who is new to Chatops word, here is pretty energetic 20min talk about ChatOps benefits from real experience in GitHub.

"ChatOps: Technology and Philosophy" https://www.youtube.com/watch?v=IhzxnY7FIvg1