I want to create an "architecture diagram" to explain our Software (libraries, Eclipse RCP, modules, features, etc.).
Visio. Considered the de facto standard for diagrams of all kinds, Microsoft Visio continues to be a popular choice for enterprise architects across all industries.
Tips to create an application architecture diagramUse simple shapes and lines to represent components, relationships, layers, etc. Group application layers into logical categories such as business layer, data layer, service layer, etc. Indicate the architecture's purpose and the intended outcomes.
A simple architecture diagram (UML) helps system designers and developers visualize the high-level structure of their system or application to ensure it meets their users' needs. It can also help describe patterns that are used throughout the design.
You can use whatever program you want as long as it can draw colored shapes.
Some people I know use PowerPoint, since you can make nice designs with it.
Or in Visio: New->General->Block Diagram. You can alter the design by right click->format->line. (You can make it more beautiful but I didn't want to spend to much time)
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