bexee - BPEL Execution Engine - bexee stands for BPEL Execution Engine and is an open source implementation of the BPEL standard. - http://bexee.sourceforge.net/
Oracle BPEL Process Manager - Oracle BPEL Process Manager enables organizations to model, deploy and efficiently make changes to business processes based on the Business Process Execution Language (BPEL) standard. BPEL is the proven standard for process orchestration and is the corner - http://www.oracle.com/appserver/bpel_home.html
Deklarit constraints engine - DeKlarit is a Rapid Application Development (RAD) tool designed to enable developers to build Business Frameworks in a declarative way with no programming. - http://deklarit.com