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zuluCrypt
zuluCrypt is a front end to cryptsetup and tcplay and it allows easy management of encrypted block devices
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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.
Forgot Zulucrypt, which is in most distros central repos since it's got a better license... Linux only tho
NOTE:
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Hence, a higher number means a more popular project.