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UnifiedNlp
Alternative network location provider for Android, with plugin interface to easily integrate third-party location providers.
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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.
The open source project microG has already reimplemented the majority of Google's proprietary Android APIs [0], so Microsoft could've definitely done it if they saw enough money in it.
[0] https://github.com/microg/GmsCore/wiki/Implementation-Status
NOTE:
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Hence, a higher number means a more popular project.