- Tioga is an open-source program you can freely download and use for creating figures and plots using Ruby, PDF, and TeX. It has a tutorial and detailed online reference material. This alternative interface to the documentation has lists of classes and methods at the top; if you scroll the middle pane down to Tioga::FigureMaker and select that, you'll get the reference manual with browser panes at the top of the window, a handy feature!