ConceptDraw NetDiagrammer is a computer network diagramming and LAN scanning tool. It allows you to draw professional network, system and UML diagrams, schematics and flowcharts.
ConceptDraw WebWave is a software for web site/application prototyping and design, page mocking-up and site-mapping. It includes many ready-made graphics, shapes, templates and wizards for quickly creating professional diagrams and drawing.