Taverna is an open source family of tools for designing and executing workflows, created by the myGrid project and funded through the OMII-UK.

IMPACT implements the Taverna Engine as the means for demonstrating the workflow interconnection of IMPACT tools.
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http://www.taverna.org.uk/

myExperiment is a collaborative environment where scientists can publish their workflows and experiment plans, share them with groups and find those of others.

IMPACT implements the myExperiment environment as a registry for demonstrator workflows and for sharing of experiences.

http://www.myexperiment.org/