The PubSub specification is produced by the W3C Social Web Working Group.
Editor's Draft: https://w3c.github.io/pubsub/
Background:
- The current spec was imported from https://github.com/pubsubhubbub/pubsubhubbub
- The working group resolved on 2016-09-23 (https://www.w3.org/wiki/Socialwg/2016-09-23-minutes#Pubsubhubbub) to publish the Editor's Draft as a First Public Working Draft (FPWD) with the name "PubSub" (shortname: "pubsub")