A solid diagramming tool from Microsoft
Microsoft Visio is a streamlined vector graphic diagramming tool for business and professional use. With Microsoft Visio, you'll be able to create and share a variety of diagrams, organizational charts, flowcharts, floor plans, and even network maps. The program offers a wide variety of templates to help you get started, and you can easily modify them using the intuitive ribbon interface and drag & drop capabilities.
Even if you haven't used a tool like Microsoft Visio before, you shouldn't have many problems. The program provides plenty of help, and when you first run it, there is an interactive guide to assist you. Modifying diagrams created with Microsoft Visio is straightforward, as all aspects are fully customizable, both aesthetically and technically. You can insert hyperlinks, documents, and CAD drawings to enhance your diagrams.
To ensure the validity of your diagrams, Microsoft Visio includes a Diagram Check function that identifies possible errors in your document. Additionally, you can share your documents via SharePoint and import Excel documents, which will be automatically converted. While not flashy, Microsoft Visio is a solid tool for creating diagrams and charts of various kinds.