Game Assets
Sprites / Art
You are of course free to create your own art assets with usual image editing software:
- Microsoft Paint
- Paint.NET
- GIMP
- Inkscape (Vector Art)
- etc…
However, you might want some already created assets:
Music and Sound Effects
Pygame consistently supports WAV and OOG files for audio. If you need to convert some audio to this format, Audacity can help.