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KeePassDX
Lightweight vault and password manager for Android, KeePassDX allows editing encrypted data in a single file in KeePass format and fill in the forms in a secure way.
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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.
Pass - https://www.passwordstore.org/
Keepass has an android version https://www.keepassdx.com/
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.