Tux Paint is a free, fun drawing program built for young children (kids over the age of 3).

It has a simple, easy-to-use interface, fun sound effects, and an encouraging cartoon mascot who helps guide children as they use the program.

Tux Paint provides a blank canvas and a variety of drawing tools to help your child be creative. Additional artwork ("stamps") can be downloaded and installed, providing a sticker-book functionality.

Tux Paint has been translated into over 45 languages, and a graphical configuration tool for parents and teachers is available which allows Tux Paint to be reconfigured to suit the special needs of children or the classroom environment.


Features
Multi-Platform

Works on Mac OS X (Intel and PPC), Windows (Windows95 through Vista), Linux and other systems.
Simple Interface
A number of useful drawing tools are made available. (See Drawing Tools, below.)
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.
Entertaining Interface
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.
Drawing Tools
Paint brush
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
Rubber stamp
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
Uses Paint Brush's brushes
'Rubberband' shows where the line will be drawn as you move the mouse
Shape tool
Draw various filled and unfilled polygonal shapes
Rotate shapes (this feature can be disabled for younger children)
Text tool
Comes with various fonts
Bold, italic and size can be changed
Parents/teachers can add more fonts
Supports numerous languages (See International Character Input, below)
'Magic' (special effects) tool
Blocks - turn parts of the picture 'blocky'
Blur - blur parts of the picture using the mouse
Bricks - paint realistic large or small brick patterns
Calligraphy - a smooth brush that changes thickness depending on how quickly you stroke
Cartoon - make parts of the picture look like a cartoon
Chalk - make parts of the picture look like a chalk drawing
Darken - darken the colors of parts of the picture
Distortion - slightly alters the position of the picture under the brush
Drip - make parts of the picture look like it's dripping away
Emboss - gives the image's edges highlights and shadows
Fill - 'flood-fill' an area with a particular color
Flip - flip the image vertically
Flower - draws curvy-stalked flowers
Foam - paints foamy bubbles that grow as you move the mouse
Glass Tile - see your drawing through glass tiles
Grass - paint realistic clumps of grass on the screen and into the distance
Kaleidoscope - four symmetric brushes
Light - draw beams of bright light on your picture
Lighten - fade the colors of parts of the picture
Metal Paint - paints shiny metallic colors
Mirror - flip the image horizontally
Negative - invert the colors of parts of the picture
Rainbow - draw using a brush that paints in all colors in the rainbow
Ripples - rippled waves over your image
Shift - move the entire picture around
Smudge - push the colors around as though smudging wet paint
Tint - change the color of parts of the picture
Waves - wiggle your picture
... plus, programmers can easily and quickly create new 'Magic' tools using a plug-in interface!
Eraser
Undo
Multiple levels of undo
Undo actions can themselves be undone with the 'Redo' button