GrailsFlow is an open source Workflow and Process Engine.
The plugin is written using Groovy and Grails and can easily integrate with other Java, Groovy or Grails applications. Target usage of the system is for midsize applications with 10.000´s of processes in the application and hundreds of new processes per day.
It is now compatible with Grails 2.4.x, current released version: 1.7.7 release notes
Lead: July Antonicheva