mORCA is an easy-to-use web-based lightweight mobile client for the management of bioinformatics and biomedical web-services. This client is able to browse, select, compose parameters, invoke, and monitor the execution of Web Services stored in catalogues or central repositories. It efficiently integrates different type of web-services repositories mapping metadata over a general definition to support scalable service discovery and to achieve flexible inter-communication between tools. mORCA manages repositories heterogeneity supported by the Modular-API that provides a uniform view of metadata (e.g. GRID-based, WSDL–services, BioMoby and others), making the integration of bioinformatics Web-Services easier.