Questions[diagram](ubuntu)

I have been using "Dia" to draw UML class diagrams in Linux environments. However, it seems that Dia is not under active development, and its UI is not as good as LibreOffice Draw.

Could I also use Libre Office Draw to draw UML diagrams efficiently?

I could find some custom shapes from the following page. http://www.lautman.net/mark/coo/index.html

However, I think these are just figures so they are not as useful as Dia UML class diagrams. So, I wonder what would be the best way to draw UML class diagrams using LibreOffice.

I need to insert a greek letter in a diagram. Is it possible to do this and how?

Writing a commercial proposal, I want to create a nice graphic showing the clients the architecture I thought of for their IT network, with servers, network connections, firewall, load-balancing, etc.

For years I have been using dia, but I am tired of it because: the results are not satisfying, very few network elements are available, and each element's graphic representation is really ugly.

Question: How to create nice network diagrams?

If a better set of elements was available for dia, that would be a solution.