Credits

• Hat, Turtle and Spectre tiles: David Smith, Joseph Samuel Myers, Craig S. Kaplan, and Chaim Goodman-Strauss
• Program: LGPL v3 by Arnaud Chéritat, includes third party copyrighted material (see below)
• Features suggestions and UI fine-tuning advising: Ortwin Schenker and David Smith
• Palette image CC By SA 4.0 Intl by VideoPlasty, brush adapted from it.
• Eraser image C0 by JohannPoufPouf
• Magnifier image C0 by AlphaZeta
• Hand image C0 by Manuel Campagnoli
• Toggle switch: MIT licence by ClawHack1 on UIverse
• Rubber stamp: CC0, found here
• Palettes: Ortwin Schenker, Dave Smith, Color Brewer 2, Coolors.
• Code hints: stackoverflow users