Edutools compares open source and proprietary learning content management systems in terms of their features.

UNESCO: Free and Open Source Software for E-learning

The largest of the commercial open source application companies like Alfresco, the enterprise content management vendor, are smaller than that.

FORBES: Red Hat At $1 Billion

With more 3D content created online, the curation and management of open online databases becomes more onerous for these database owners.

FORBES: The launch��and the pivot

Google is also releasing the connector software as an open-source product so developers can build connectors to what Google executives said are about 300 other content management systems on the market.

FORBES: Google Digs Deeper Into Business