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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 use KeePassXC for my passwords. https://keepassxc.org/ I'm the kind of type who doesn't like syncing, even on trusted services. Local stored only.
SilentNotes, my own application, offers a user password, end-to-end encrypted synchronization and is open source. Currently supported algorithms are XChaCha20-Poly1305, Aes-256-Gcm and Twofish-256-Gcm.
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.