Taverna Player is a Ruby on Rails plugin to run Taverna Workflows using Taverna Server. Taverna Player surfaces a workflow in three ways: As a Web interface in the browser; As an embeddable widget to be included in any other Web page; As a REST-based Web Service. All three modes provide functionality to fully configure a workflow's inputs; run the workflow on a Taverna Server; collect workflow outputs, logs and messages; and present the results in an appropriate manner.