RedGreen can be used to easily create 3D images which can be viewed with red-green or red-blue 3D glasses. All you need is a digital camera to shoot two photos (one photo from the view of the left eye and one from the view of the right eye). Open these photos with RedGreen and it will calculate a 3D image that can be viewed with the 3D glasses.
What's new in RedGreen
French translation added. Many thanks to Pierre Beaud for the translation.