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cross-device-sdk
The Cross device SDK allows developers to build rich multi-device experiences with a simple and intuitive set of APIs
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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.
Looking at the repo, I don't see any mention of iOS.
NOTE:
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Hence, a higher number means a more popular project.