Piwigo is a veteran open-source gallery that has been going since 2002 and it shows in its maturity and flexibility. You can self-host it for free under the GPL, or take French-hosted managed plans and it offers fine-grained sharing controls, user management and more than 200 plugins and themes. It is a strong pick if your goal is organising and sharing large photo collections. It is not, however, an encrypted private vault, there is no end-to-end encryption, the interface feels dated next to modern rivals, and the mobile experience is functional rather than polished.

Piwigo
Mature open-source photo gallery you can self-host or have managed.
piwigo.org
FreemiumOpen SourceAndroidiOSWebFrance
Pricing The GPL-2.0 software is free to self-host; managed hosting and support plans start around €29/mo (billed annually), with capacity depending on your plan or server.
Strengths
- Very mature and stable, since 2002
- Fine-grained sharing and user management
- 200+ plugins and themes
- EU (France) managed-hosting option
Considerations
- Dated interface compared to modern rivals
- Not end-to-end encrypted
- More a shared gallery than a private encrypted vault
Listed in Photo Storage
Piwigo alternatives
Internxt PhotosZero-knowledge encrypted photo storage from an open-source, EU-based provider.
Ente PhotosEnd-to-end encrypted photo storage with real native apps on every platform.
CrypteeEncrypted documents and a private photo vault in one.
ImmichSelf-hosted Google Photos alternative with automatic mobile backup.