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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.
When this first hit the news I started planning my migration. I settled on Enpass https://www.enpass.io/ . The main client is closed source but the password file is an encrypted SQLite database and is readable by open source tools (written in Go https://github.com/hazcod/enpass-cli).
The UI isn't quite as polished as 1Password but it's pretty good, and more consistent/discoverable IMHO.
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.