Imhotep is a declarative process framework useful for construction of "workflow" scenarios ranging from lightweight state-event-response logic (for example, the typical process logic behind a wizard dialog), to long-running persistent and failsafe workflows.
Imhotep supports visual definition of both process and routing of work to be performed by processing agents.
Imhotep comprises process execution, work-router, and persistent timer frameworks, each of which can be used independently for a wide variety of tasks.
Zebra is a workflow engine - originally developed to fill in the gaps in some commercial and open source workflow engines. The key differences between it and other workflow systems are
* Able to model all the workflows described in workflow patterns
* An easy to use GUI designer
* Interfaced persistence layer
* OO Design
* Integration component for Turbine web applications
Apache ODE (Orchestration Director Engine) executes business processes written following the WS-BPEL standard. It talks to web services, sending and receiving messages, handling data manipulation and error recovery as described by your process definition. It supports both long and short living process executions to orchestrate all the services that are part of your application.
One of the biggest promises of Business Process Management was that the business people can model and execute their business processes without involvement from IT folks. This promise was kept in a simple workflow sceanarios by utilizing limited number of 'built-in' activity types of BPMS packages but once you face little more complex business process sceanarios providing transactional integration with existing software and complex interactions with human beings, this limited expression power make it hard to drag and drop process modeling, and finally it brings a huge help from software vendors or system integrators and write a lot of code that is making processes utterly inflexible downstream. That means, concurrent BPMS is extremely lack in something like 'Technical Abstraction' and 'Expression Extensibility'.
They offer xProcess, quite an extensible project/process/task/issue management tool that allows to define processes for project management etc. which can be used in real time.