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keepassxc
KeePassXC is a cross-platform community-driven port of the Windows application “Keepass Password Safe”.
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authpass
AuthPass - Password Manager based on Flutter for all platforms. Keepass 2.x (kdbx 3.x) compatible.
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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.
KeypassXC is under active development, has a more modern UI and has a link to recommended IOS apps. https://keepassxc.org/ I am not sure if it is the best option for IOS, but it is a starting point.
If you are willing to set up a WEBDAV server on your Mac, you can try AuthPass, which is FOSS project that uses KeePass password database.