You should probably mention that “web hooks” are a specific concept — as explained in webhooks.org — to avoid getting general answers about the network, as I see it, you already have one. This is hardly a popular or widespread concept, so the total confusion of the defendants is not surprising, but easily predictable.
For your question, I know Hookah (from webhooks.org) and durian (web hooks for Django). There are special ones like TracWebHooks for adding web hooks to the Trac problem tracking service, but I understand that you are looking for something else at all.
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