Communifire - Enterprise Social Collaboration Software
Apache Archiva - Apache Archiva is an extensible repository management software.
Workplace by Facebook - Connect everyone in your company and turn ideas into action.
Apache Tika - Apache Tika toolkit detects and extracts metadata and text from different file types.
DigitalChalk - Online Training Software and Learning Management System (LMS)
Apache Ambari - Ambari is aimed at making Hadoop management simpler by developing software for provisioning, managing, and monitoring Hadoop clusters.