GIMP is the GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring

The GNU Image Manipulation Program, or GIMP, is a raster graphics editor used to process digital graphics and photographs. Typical uses include creating graphics and logos, resizing and cropping photos, altering colours, combining multiple images, removing unwanted image features, and converting between different image formats.^[2] GIMP can also be used to create basic animated images in GIF format. It is often used as a free software replacement for Adobe Photoshop, the most widely used bitmap editor in the printing and graphics industries; however, it is not designed to be a Photoshop clone.^[3] The project’s mascot is named WilberGI

Flexify Photoshop Plugin

Flexify is a Photoshop plug-in that allows you to bend spherical panoramas into vertiginous new shapes.

http://www.flickr.com/groups/flexify/pool/

You can use the Adobe Video Workshop to start learning about any application you’re interested in, whether you own it or not. The Video Workshop shares expertise from across Adobe and the Adobe community—you’ll learn tasks, tips, and tricks from leading designers, developers, and Adobe experts. There are introductory videos for new users, and more experienced users can find videos on new features and key techniques. Many videos show you how to use Adobe applications together.

When you start the Video Workshop, you choose exactly the products and topics you want to learn (see Figure 1). You can see details about each video to help focus your learning path. Each video covers a single subject and typically runs about 3 to 5 minutes. Many videos come with an illustrated tutorial and source files, so you can print out detailed steps and try the tasks on your own.

http://www.adobe.com/designcenter/video_workshop/about.html