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Data Sources
Files (CSV, XML, Excel etc.)
Local databases
External databases
External services/APIs like
Europeana, WikiPedia/WikiData etc.
User interfaces for editing
Crowdsourcing

Service Features
Efficient pan and zoom of huge images
Multi-layer annotations with any content
Collaborative annotating
Image blending comparison
Support for touch devices
HTML5 implementation

Clients
GLAM organizations (galleries, libraries, archives and museums)
Online publishers of newspapers, magazines, books
Hospitals, medical sector
Technology sector with need to enrich technical images with additional information