Is it possible to only use straight lines in a class diagram? - PlantUML

At least there is an option to use straight lines. Curved lines in an UML diagram look really strange to me. The implementation is far from perfect, but gets the job done for now.

Mermaid

Ever wanted to simplify documentation and avoid heavy tools like Visio when explaining your code?

This is why mermaid was born, a simple markdown-like script language for generating charts from text via javascript.

Looks useful in the Asciidoc context, but according to sources this is still very rough around the edges. Need to keep an eye on this though.