Today it's possible to use Octopus to promote releases between completely isolated Octopus servers - you can see some approaches in our documentation on working with isolated Octopus servers. However, to make it work requires using our REST API and isn't as smooth as it could be.
In 2018 we plan to make promoting releases between isolated Octopus servers a first-class feature. For an overview of our plans, check out our public RFC on plans for Remote Release Promotions in Octopus.
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Exensibility & REST API
The Octopus UI is built over a REST API, so anything the UI does, you can do too
Currently updating a deployment process in @OctopusDeploy. I forgot how easy this was to use, everything just makes sense.— David Swindells (@d_swindells) January 30, 2019
Tools like @OctopusDeploy can be great in enabling culture change, we've been able to scale and improve our configuration story since we started using it.— Neil Chalk (@_neilch) July 19, 2018