xBook is a common framework for several archaeo-related database applications developed and published by Ludwig Maximilian University of Munich.
All database applications that are based on the framework (called Books) provide the same basic technical features, but each application can be extended individually. Especially the Synchronisation and the User Rights Management are strong features that allow creating backups and sharing your data to collaborate with other users. The Synchronisation is the base for future cross-application similarity searches involving all available Books.
Stable and works.