We present a practical approach to the design of a Web system for 3D and volumetric data interrogation and visualization. This Web application provides different functionalities including isosurface extraction, mesh simplification, output file production in a standard format, and data compression. The application is designed in a modular way, and its services are suitable for heterogeneous clients, including wireless and diskless Personal Digital Assistant. The use, as much as possible, of widely available public domain software and standard data format are important characteristics of the presented architecture.