Hi,
As for Apigee, do you have or know of an emulator for the Integrated Portal which could be run offline to help develop and maintain content in a repo? It would be really useful to version-control content and then to develop automated pipelines to deploy it to a live online portal.
No, there is no offline or "emulator" option. The good news is that you can create multiple distinct portals "online" and test your portal development that way.