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nami-apple
Easy Apple subscriptions & in-app purchases, with powerful built-in paywalls and A/B testing.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Any service that has a backend that gets push notifications from Apple will be told that, and you can look up details - I worked for one company, NamiML that had that as part of the service (and it had web hooks so your own server could react to user with a registered account having services disabled at a particular date).
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.