Direct links source code	Matt Newelski
Menu icons	Eleonor Wang
Cat picture	Jose Luis Sanchez Pereyra
Meows audio	Sound Bible
Vintage clock face	Clipart Library
Gray floral wallpaper	Transparent Textures
Pretzel picture	Monika Schröder
Canadian cities' data	JP Richardson
US cities' data	Rich Jones
Kids and brush icons	Freepik
Touchscreen drawing source code	Ruadhán O'Donoghue
Brick breaker game tutorial	Mozilla
LCARS Computer style sheet	Sean P. Stephenson