Adding @jesse_wilson and/or @joeymorisette for visibility. Both have contributed to this terrific Docusign article which might point you in the right direction. Depends on what you're looking for specfically.
From my perspective, all the app hub models, other than Anaplan models, have been taken over by the Anaplan partners (the ones that actually built them). I suppose it makes sense since they would like to share their content with you.
You can search the App Hub but in a different way now. However, I think it only pulls up Anaplan models.