Generating invoices is made easy with LaTeX. The invoice package created by Oliver Corff allows you to create a simple invoice with the minimum of code.
We've loaded up an example template from Paul Asmuth's blog so you can give it a try with one-click - no sign up required!
Invoice package by Oliver Corff, example by Paul Asmuth
A neat example of what can be created in LaTeX, this shows real and monetary flows in an agent-based macroeconomic model with endogenous money.
This diagram is originally from TeXample.net; we've pre-loaded in writeLaTeX for you to try out.
To read more about it visit this TeXample page, or just click below to get started.