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keepassxc
KeePassXC is a cross-platform community-driven port of the Windows application “Keepass Password Safe”.
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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 like portable-secret which uses the built-in browser cryptographic functions, no external software.
https://github.com/mprimi/portable-secret
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.