Tux Paint

Tux Paint is a free, award-winning drawing program for children ages 3 to 12 (for example, preschool and K-6). It combines an easy-to-use interface, fun sound effects, and an encouraging cartoon mascot who guides children as they use the program.
Kids are presented with a blank canvas and a variety of drawing tools to help them be creative.

Features
  • A number of useful drawing tools are made available.
  • The drawing canvas is a fixed size, so the user doesn't need to worry about 'pixels' or 'inches' when making a new picture.
  • The entire program fits on a screen as small as 640x480, and can be displayed full-screen, to hide the computer's underlying 'desktop' interface. (It defaults to 800x600 mode, but can run at larger sizes and in portrait or landscape mode, as well.)
  • Loading and saving of images is done using thumbnails, so no knowledge of the underlying operating system's filesystem structure is needed. Even filenames are unnecessary.
  • Fun sound effects are played when tools are selected and used.
  • A cartoon version of Tux, the Linux penguin, appears at the bottom to give tips, hints and information.
  • Various brushes available
  • Parents/teachers can add more brushes
  • Brushes can be animated
  • Brushes can change shape depending on the direction they're drawn
  • Alternate color palettes can be created and used
  • Hundreds of photographic and cartoon stamps images are available
  • Parents/teachers can add more stamps and create categories
  • Stamps can have descriptive text and sound samples (names, facts, etc.) and/or sound effects assigned to them
  • Stamps can be resized, flipped and mirrored
  • Raster bitmaps (Portable Network Graphics ("PNG")) with full-color and alpha transparency (32bpp RGBA) supported
  • Vector graphics (Scalable Vector Graphics ("SVG")) supported
  • Line tool
  • Shape tool
  • Text and Label tools
  • 'Magic' (special effects) tool
  • Eraser