Pixi Paint!

Paint (formerly Paintbrush) is a simple, ultra-basic graphics painting program that is included with almost all versions of Microsoft Windows. It opens and saves files as Windows bitmap (24-bit, 256 color, 16 color, and monochrome, all with the .bmp extension), JPEG, GIF (without animation or transparency), PNG (without alpha channel), and TIFF (without the multiple pages).

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.

Pixen is a pixel art editor designed for working with low-resolution raster art, such as those 8-bit sprites found in old-school video games. With innovative features like a color palette system, patterns, and high-zoom support, Pixen packs all the tools pixel artists need in an intuitive, Mac-native interface. Pixen also makes creating frame-by-frame animations fun and easy.

Free online photo editing software.

Paintbrush is a simple paint program for Mac OS X, reminiscent of Microsoft Paint and Apple’s own now-defunct MacPaint. It provides users with a means to make simple images quickly, something which has been noticeably absent from the Mac for years.

Pixelsque's goal is to be as simple as possible, while still retaining many powerful features. It works like any standard pixel art editor, with a pen, eraser, and shapes. Pinch zoom and two finger drag can be used to move around the image from anywhere. Lesser-used functions such as save/open/new, and others can be found in the menu, saving valuble screen space on phones, and allowing easy access on tablets. It fully supports all Android devices from low-end phones to high-end tablets.

MyBrushes Paint for Mac app allows you to paint on infinite canvas and PLAYBACK whole drawing.

Pro Paint for Mac is the realistic full-featured digital paint software for Mac that is used for painting, image editing, vector drawing, free-form transformation, cropping, alpha channel editing... It provides high quality image manipulation tools for original artwork creation.Pro Paint for Mac enables your works to be showcased just as impressive as what you can create on a physical canvas.

Paintastic allows you to make beautiful drawings, paintings, designs and greeting cards.With just a few strokes on your Android smartphone/tablet you can create colorful drawings and bring out your inner artist. Here are some features that make Paintastic a powerful and quick draw and paint tool suitable for all ages (for kids as well as grownups):

Gtk based basic paint program like MSPaint or Paintbrush but for Linux

Photoshop Online Free Alternative Photo Editor By Toolpic, Turn your Pictures into Living Being by Using our Online Web based Photoshop Alternative

Easily Draw and Create Graphic Images. DrawPad Graphic Design and Drawing Software is an easy-to-use image composition and manipulation program, and an essential tool for all types of graphic design projects, including: Creating banner ads or invitations, Make sketches and paintings on your computer, Draw diagrams, icons and other web graphics. DrawPad is ideal for creating images, drawings, and for paintings. DrawPad features pencil and brush tools, raster and vector images, image layers for non-destructive editing, and effects such as bevels and shadows. Editing features include crop, rotate, resize, and flip. DrawPad also supports png, bmp, jpg, gif, pdf, and svg formats. »

S-Paint is a simple and straightforward alternative to MS Paint.