Open Source Image Editing and Graphics don't have photoshop - no problem
GIMP - gimp.org[gimp.org] The GNU Image Manipulation Program is a Photoshop replacement that doesn't have "quite" as much functionality but it's excellent for free. It comes installed by default on many Linux desktops and is also available in Windows. Worth a look.
Paint.net - getpaint.net[getpaint.net] A really good, lightweight alternative to Photoshop. It offers layers, unlimited undo, special effects and a wide variety of useful tools. The download is around 2mb too so absolutely worth a look - I use this when Photoshop is playing up. Ps Plug-ins here.
ImageMagick - imagemagick.org/script/index.php[imagemagick.org/script/index.php] A lesser known application but it offers the ability to "create, edit, and compose bitmap images. It can read, convert and write images in a variety of formats (about 100)". Use it to "translate, flip, mirror, rotate, scale, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves."
