有没有简单方便的免费工作流引擎？

ofbiz可能太复杂了，在sourceforge有很多，但不知道哪个好。

最近很衢T的

http://www.jbpm.org/

jBpm is a flexible, extensible workflow management system. Business processes , expressed in a simple and powerfull language and packaged in process archives, serve as input for the jBpm runtime server. jBpm bridges the gap between managers and developers by giving them a common language : the jBpm Process definition language (jPdl). This gives software project managers much more control on their software development efforts. After loading the process archive, users or systems perform single steps of the process. jBpm maintains the state, logs and performs all automated actions. jBpm combines easy development of workflow-applications with excellent enterprise application integration (EAI) capabilities. jBpm includes a web-application and a scheduler. jBpm is a scalable J2EE application. For easy of evaluation, the binary download contains a preconfigured JBoss application server.