Different tools available in Tux Paint cannot be used in one image
Answers
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
Color picker, for choosing colors from a drawing
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
Fill
'Flood-fill' an area with a particular color
Recently moved from 'Magic Tools' to the main toolbar (New in 0.9.24)
Shape tool
Draw various filled and unfilled polygonal shapes
Rotate shapes (this feature can be disabled for younger children)
Text and Label tools
Come with various fonts
Bold, italic and size can be changed
Parents/teachers can add more fonts
Supports numerous languages (See International Character Input, below)
Labels may be moved or edited later
'Magic' (special effects) tool
Blind - pull window blinds down, or across, the picture
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
Color & White - turn the picture monotone
Color Shift - Jumble the colors of the picture
Confetti - Throw confetti over your picture
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
Edges - outline the edges of shapes in yur picture
Emboss - gives the image's edges highlights and shadows
Fisheye - view parts of your picture through a fish-eye lense
Flip - flip the image vertically
Flower - draws curvy-stalked flowers
Foam - paints foamy bubbles that grow as you move the mouse
Fold - fold down the corners of your picture
Glass Tile - see your drawing through glass tiles
Grass - paint realistic clumps of grass on the screen and into the distance
Hexagon Mosaic - create a pattern of hexagons
Irregular Mosaic - turn your picture into a mosaic of shards
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
Mosaic - make your picture into a mosaic of colors
Negative - invert the colors of parts of the picture
Noise - add random noise to your picture
Perspective - bend your picture to view it from different perspectives
Picasso - a triplet of brushes that paint in unison
Puzzle - shift parts of your picture around like it's a sliding puzzle
ROYGBIV Rainbow - draw a rainbow arc of seven solid colors
Rails - draw connecting train tracks
Rain - add raindrops to your picture
Rainbow - draw using a brush that paints in all colors in the rainbow
Real Rainbow - draw a colorful arc based on a real photo of a rainbow
Ripples - rippled waves over your image
Rosette - three brushes that draw in a rosette pattern
Shift - move the entire picture around
Silhouette - turn parts of your picture into a silhouette
Smudge - push the colors around as though smudging wet paint
Snow Ball - cover your picture in snowballs
Snow Flake - cover your picture in snowflakes
Square Mosaic - create a pattern of squares
String V - draw V-shaped string art
String corner - draw string art
String edges - draw string art around the edges of your