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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.
These days KDE Wallet is more useful than it was before, previously only apps that specifically support KWallet or those that used the QtKeychain library would use KWallet, but now KWallet also supports the Freedesktop Secrets Service API too, so apps using that to store passwords will also work (previously those will either try to use whatever else implements the Secret Service API like GNOME Keyring or KeePassXC, use their own method for remembering passwords/keys or just never remembering them at all).
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.