Every Libre Wave product has a tab labelled Requirements on its store page. Please view this tab for the product you are interested in to see what additional software (if any) is required to run it.
In general Libre Wave products are available as independent VSTi or VST plugins that do not need a separate player application to function. They do however require a VST host application such as a Digital Audio Workstation (DAW). In my opinion the best libre DAW available is Ardour.