Adobe
Produces software for web design and development, motion graphics, digital imaging, communication, and video. Details of their range of products, technical support and downloads.

Filter Forge
A software plugin for Adobe Photoshop that allows users to create filters to create visual effects. The website contains a library of filter effects that are available.

Pixarra
The creators of software for digital painting, such as TwistedBrush. There are product details, tutorials, and an image gallery.