Very soon - December 31, New Year. But at the same time, the free Developer Edition in the Urban Airship Push Notifications distribution system has been
designed . The company offers either to buy a paid subscription, or go to other push providers.
Let's see what options we have.

It’s very sad when a service closes a free subscription, it forces users to look for alternatives and undermines trust in the service. I was able to find two push notification platforms that provide automated migration tools from Urban Airship.
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First consider the service
Pushwoosh . Recently, a blog post about the possibility of
automatic migration. Everything is quite simple - we create an application, enter APP_ID & API_MASTER_KEY (from Arban Airship). After that, all our subscribers go to this application, and after we set up the settings for the platform of interest to us, you can start sending push notifications. At the same time, badges (for iOS devices) and tags are saved.
A free subscription to Pushwoosh
provides:- 5 applications
- 1,000,000 devices
- Rich pages
- 2 RSS feeds
- View history push (analytics)

The second service that offers the
automatic migration tool Parse. Migration happens in a similar way.
A free subscription to Parse
provides:- 1,000,000 devices
- Analytics
iOS devices in Parse for some reason did not emigrate.
Both platforms provide an SDK for popular platforms (iOS, Android, ...). The issue of the SDK migration for the application in this post will not be covered as it depends on how quickly you can update the applications for each platform (in each stack).
It would be interesting in the comments to discuss the pros and cons of existing platforms for sending push-notifications.