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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.
It sounds like you are mixing some terms up. Open Source Software does not mean free of charge. The source code is open, modifiable (and usually instructions are given to build it). However, there are some licenses for this software. Cryptomator's Android code is here: https://github.com/cryptomator/android and the license, what to do with this software is here (You obviously can't just stick a different logo on top and sell it as your product).
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.