The OWL-S Composer is an open source plugin that supports graphical Web Services composition under Eclipse, helping inexperient developers to build OWL-S compositions and giving a pratical solution for the experient ones.
...Supports the evaluation of rule-based (SWRL) ontology mappings to provide trust in a distributed multi-actor environment with heterogeneous independent information models materialized in OWL ontologies. See QualiPSo.org
JS-OWL is an AJAX enabled Object-orientated Widget Library for pure Web Application development providing a comprehensive set of JavaScript UI components on which to build a rich user interface.