Tux Paint on X: "Tux Paint forest scene. We used the Lightning magic tool (coming in v.0.9.27), drawing them upside-down on a black background, then used the Negative tool to invert the
Install tux-paint on Ubuntu using the Snap Store | Snapcraft
Tux Paint - GNU Project - Free Software Foundation
Tux Paint - Wikipedia
Tux Paint 0.9.30 Digital Painting App for Kids Adds Support for Sizes to Magic Tools - 9to5Linux