A project to create a general ActivityPub server. Implemented in Elixir.
Project has a very cool logo and very similar goals as CPub. Implementation is very different. CommonsPub stores ActivityPub objects as JSON blobs (like Pleroma) and exposes data via a GraphQL endpoint. They don't do any Semantic Web stuff.
As of early 2020 development of CommonsPub has resumed as a fork of MoodleNet (which itself was a fork of the original CommonsPub code, which was at least partially a fork of Pleroma).
Apparently there is an ongoing effort to use CommonsPub for the Valueflows ontology.