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WhatsApp-Key-DB-Extractor
Allows WhatsApp users to extract their cipher key and databases on non-rooted Android devices. (by p4r4d0x86)
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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.
I've used Titanium Backup (modded) on BS4 to backup Whatsapp, though you can do it via this tool from GitHub without mods or root.
NOTE:
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Hence, a higher number means a more popular project.