The term "xUML" is a bit ambiguous here, since it may refer specifically to the Kennedy-Carter version of executable UML (BTW, that tool is now supported by Abstract Solutions (http://www.abstractsolutions.co.uk/), but I do not think that it is free). However, there are a number of executable UMLs, including, most notably, the OMG standard fUML. This is supported by the open source Moka add-in to the open source Papyrus tool (https://wiki.eclipse.org/Papyrus/UserGuide/ModelExecution).
In addition, there is "xtUML", which is supported by the open source BridgePoint tool, provided by OneFact (http://onefact.net/bridgepointpro/). This one is semantically very close to the Kennedy-Carter "xUML" tool, since they were both based on the Shlaer-Mellor method.
There are also numerous research prototypes. A partial and slightly dated list of various executable UML tools (open source and otherwise) can be found at Jordi Cabot's site:
http://modeling-languages.com/list-of-executable-uml-tools/
To the best of my knowledge, TOPCASED is migrating to Papyrus (see: http://olex.openlogic.com/packages/topcased ). However, I do not know what is the status of their legacy tools and if the UML model simulator is still available.
Sorry, wrong URL in the previous response. The right one is:
https://www.polarsys.org/topcased
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