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auth
Discontinued Fully open source, End to End Encrypted alternative to Google Photos and Apple Photos [Moved to: https://github.com/ente-io/ente]
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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.
If access is not an issue, I would buy a large backup drive and keep the photos there. If you do want always-on access and availability, and are familiar with self-hosting, I see Immich getting mentioned a lot, but I have not tried it.
I didn't use Google Photos but iCloud Photos and I switched to ente.io when I left the Apple ecosystem.
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.