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notifo
Multi channel notification service for collaboration tools, e-commerce, news service and more.
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pushd
Discontinued A broker which eases the process of delivering notifications from local services to Apple devices asynchronously
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
I am working on Notifo since a while: https://github.com/notifo-io/notifo
Not entirely sure whether you're looking for anything like this, but I'm currently developing a Push Notifications Daemon for Apple devices myself, though I do not recommend its use because I haven't tested it thoroughly yet and there are probably loads of bugs, plus I'm totally blind which makes me rather slow, but I'm actively working on it, and once it's complete you can use it in your project. The README.md file contains instructions on how to create a very small sample project for testing push notifications on iOS devices.