Here is the list of the top open source digital assets management solutions:
Razuna DAM lets you centralize all your digital assets, automate and streamline your workflow, publish your assets directly to the web and collaborate with your team on all your assets.
ResourceSpace is a web-based, open source digital asset management system which has been designed to give your content creators easy and fast access to print and web ready assets.
Drupal is an open-source platform and content management system for building dynamic web sites offering a broad range of features and services including user administration, publishing workflow, discussion capabilities, news aggregation, metadata functionalities using controlled vocabularies and XML publishing for content sharing purposes. Equipped with a powerful blend of features and configurability, Drupal can support a diverse range of web projects ranging from personal weblogs to large community-driven sites.
Gallery gives you an intuitive way to blend photo management seamlessly into your own website. Not all the features of a DAM but worth a try.
Other Open Source DAM software
Islandora is an open-source software framework designed to help institutions and organizations and their audiences collaboratively manage, and discover digital assets using a best-practices framework. Islandora was originally developed by the University of Prince Edward Island’s Robertson Library, but is now implemented and contributed to by an ever-growing international community.