Wow, I discovered the package #calctab for #TeXLaTeX and it makes my writing of invoice-like letters so much easier. I probably can dump the #LibreOffice calc sheet I built for the calculations.

Together with #scrlttr2 from the #KoMa bundle it's a charm to write them and get a professional looking result. Again focus on the content and not the styling.

A big thank you to Roberto Giacomelli and all the other people writing great modules.