Prototyping Papers is a set of LaTeX papers designed to help you write notes, small documents, memos, etc. All A4 templates are ready to download and print, via the preview/
folder.
The simplicity of the programming done on these files makes them highly customizable and can be easily adapted to your wishes.
To build the files yourself, you'll need a LaTeX edition with font support (notably XeLaTex). That's why I recommend using Overleaf to edit and compile programs from the web. All you have to do is clone the GitHub repository from the site.
These are the papers you can edit and directly use at the moment.