What are some alternatives?
When comparing Unifosys OrgDoc and Dia, you can also consider the following products
Flowchart.com - Online real time collaboration Flow chart software service.
draw.io - Online diagramming application
BizRun - Manage HR and grow your business visually.
yEd Graph Editor - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
OrgWeaver - OrgWeaver is a cloud-based organizational chart software.
Visio - Simplify and communicate complex information using data-linked diagrams.