Here is a very instructional piece from Michael Angeles explaining how to use Excel databases & Visio diagramming software to transform a spreadsheet into a flowchart automatically. It requires some up-front planning & design, but it can be worth it if you make a lot of diagrams. Check out Automating Diagrams with Visio « Boxes and Arrows for the full … Read More
The Pencil Project: Open-source diagramming & wireframing
The Pencil Project is an open-source software for all operating systems, that lets you quickly create mockups, prototypes, flowcharts, and diagrams. It is absolutely free & very easy to use. You can download additional free stencil packs from here.
Make Interactive Visualizations: Graphviz
Graphviz | Graphviz – Graph Visualization Software. Graphviz is open source graph visualization software. Graph visualization is a way of representing structural information as diagrams of abstract graphs and networks. It has important applications in networking, bioinformatics, software engineering, database and web design, machine learning, and in visual interfaces for other technical domains. The Graphviz layout programs take descriptions of … Read More