Right on the heels of Parse shutting down, Apple have announced they’re expanding the capabilities of their similar API, CloudKit:

In addition to providing a web interface for users to access the same data as your app, you can now easily read and write to the CloudKit public database from a server-side process or script with a server-to-server key. Learn more about generating a server-to-server key and composing web service requests.

Now users of CloudKit can interact with the data from their own server. To be a serious replacement for Parse, however, there needs to be a way for non-Apple clients to interact with it.