I put on this page all the external resources that I've used on this website. Check the licence, they can be not under GPL3 which is only for the source code.
I use the default browser's font.
GIF drawn by VioletCross (all rights reserved, but it's my furso).
The Glider comes from catb website.
I use SVGs from Wikipedia.
The links on the buttons are often websites where I found them.