For the Macintosh:

GraphicConverter ($35)
This is a great little program that helps you make pictures for the Web.

GifBuilder (free)
This one makes GIF animations for you. You provide the pictures, and GifBuilder puts them together into an animation.

Adobe Photoshop ($995)
Photoshop is the big daddy of graphics programs. A lot of people use it to make pictures for their Web sites since it's so powerful, but check out the price tag! Yikes! Adobe often has discounts for schools, however, so ask about that before shelling out any cash.

For Windows:

GIF Construction Set ($20)
This program makes GIF animations for you. You provide the pictures, and the GIF Construction Set puts them together into an animation.

LView Pro (free, 21-day trial; then $40)
This is a basic image editor that helps you prepare pictures for your Web site.

Adobe Photoshop ($995)
Photoshop is the big daddy of graphics programs. A lot of people use it to make pictures for their Web sites since it's so powerful, but check out the price tag! Yikes! Adobe often has discounts for schools, however, so ask about that before shelling out any cash.

For Unix:

GIMP (free)
A great image editor that has a lot of the same features as Photoshop. There is one big difference, though: It's free!