Piwigo

Open-source photo library and asset manager, free to self-host with no feature limits.

Piwigo core is open source and free to self-host with the same features as the hosted Cloud service. Cloud hosting is paid.

Typical nonprofit uses:

• Run the internal photo library on your own server
• Publish public program galleries
• Let chapters contribute with permissions
• Keep full data ownership in Europe or at home

Pros:

• Open-source core, no feature limits self-hosted
• Albums, tags, permissions and plugins
• Export everything free of charge, no lock-in
• Nonprofit use case documented

Cons:

• Self-hosting needs a server and maintenance
• Cloud hosting is a paid service
• Heavier than a simple gallery plugin