BPMN, Alfresco, enkive

Activiti BPM Platform

Activiti is a light-weight workflow and Business Process Management (BPM) Platform targeted at business people, developers and system admins. Its core is a super-fast and rock-solid BPMN 2 process engine for Java. It’s open-source and distributed under the Apache license. Activiti runs in any Java application, on a server, on a cluster or in the cloud. It integrates perfectly with Spring, it is extremely lightweight and based on simple concepts.

http://www.activiti.org/

Alfresco

http://www.alfresco.com/

Enkive: The new open source email archiving and ediscovery software

http://www.enkive.org