Free software to create 2D or 3D artwork

Here is a first list of free tools to create 2D or 3D artwork for your games. This list will be updated regularly.

If you would like to recommend free software that is not on this list, please say some words about it, and add a link to the website.


Terragen for creating and rendering landscapes (easy to use):
http://www.planetside.co.uk/terragen

Google SketchUp for making streets/houses and simple furniture (easy to use). With the latest free version 6 you can even make animations (walk through your terrain) and save it as .avi files:
http://sketchup.google.com/products.html
or
http://www.download.com/Google-SketchUp/3000-6677_4-10626008.html?tag=lst-0-3

Anim8or for 3D artwork (is not very easy to use):
http://www.anim8or.com

Wings3d is also a 3d modeler programm (not very easy to use as most 3d programms)
http://www.wings3d.com/

GIMP is suitable for a variety of image manipulation tasks, including photo retouching, image composition, and image construction
http://www.gimp.org

Here is a list of free 3D modeling software with descriptions:
http://www.planit3d.com/source/software_files/3dmod.html

Maplet is another 3D modeler for free:
http://www.blitzbasic.com/Products/maplet.php

Kashmir 3D is a free terrain modeler. It renders landscapes from the world map, and you can also choose from different rendering styles (CPU-intensive):
http://www.kashmir3d.com/index-e.html

World Creator v.1.5 is an easy to use free software that comes with 256 Texture Library and 500+ Masks Library to get you started. You can create interior and landscapes for your games (Isometric, Pseudo 3D, 2D Platform, Overhead etc.). And you can make animations with it.
http://www.inet2inet.com/Main/Main.htm
(Click the second button from the left to get there)
http://www.inet2inet.com/InetSoftware/World-Creator/WC1.5_Std_C.asp

Stickman is an animation program for children and amateurs. The demo version is free and lets you render your animation as video file (.avi).
http://www.cutoutpro.com/download.html