A chess program
Default chess pieces sourced from https://en.wikipedia.org/wiki/User:NikNaks/Chess.
These images were made by NikNaks.
The images are licensed under CC-BY_SA 3.0.
The upside-down chess pieces (the camel, mann, amazon and ferz) were derived from these by flipping them upside-down.
The zebra images were sourced from https://commons.wikimedia.org/wiki/Category:SVG_chess_pieces.
These images were made by Sunny3113.
The images are licensed under CC-BY_SA 3.0.