Dia Diagram Editor is a freeware image editing application that's portable.
Here are some screenshots to illustrate the features and user interface of this application:
Free and open source general-purpose diagramming software for PC. Screenshot of Dia Diagram Editor - 1464px · 1340pxCreating technical diagrams. Screenshot of Dia Diagram Editor - 1464px · 1340pxDia Diagram Editor: Dia. Screenshot of Dia Diagram Editor - 1464px · 1340pxDrawing UML diagrams. Screenshot of Dia Diagram Editor - 1464px · 1340pxCreate highly customized diagrams. Screenshot of Dia Diagram Editor - 1464px · 1340pxCreate a diagram is easy. Screenshot of Dia Diagram Editor - 1464px · 1340pxDia Diagram Editor: Create a diagram. Screenshot of Dia Diagram Editor - 1464px · 1340pxDia is a program to draw structured diagrams. Screenshot of Dia Diagram Editor - 1464px · 1340pxDia is a program to draw structured diagrams like flowcharts. Screenshot of Dia Diagram Editor - 1464px · 1340pxDia Diagram Editor: User interface. Screenshot of Dia Diagram Editor - 994px · 777pxScreenshot of Dia Diagram Editor - Size: 994px · 777pxScreenshot of Dia Diagram Editor - Size: 994px · 777pxScreenshot of Dia Diagram Editor - Size: 994px · 777pxScreenshot of Dia Diagram Editor - Size: 994px · 777pxScreenshot of Dia Diagram Editor - Size: 994px · 777px