Visio - Free tool

Microsoft Visio

Visio is a diagramming and vector graphics application that is part of the Microsoft Office family that allows the user to create diagrams for organizational and planning purposes. The Premium edition has additional templates for more advanced diagrams and layouts, as well as capabilities intended to make it easy for users to connect their diagrams to data sources and to display their data graphically, as well as intelligent rules, validation, subprocess (diagram breakdown). one-step connectivity with Excel data, information rights management (IRM) protection for Visio files, modernized shapes for office layout, detailed shapes for site and floor plans, modern shapes for home plans, and IEEE compliant shapes for electrical diagrams.