tools 3d-modelling
sketchup.google.com∞ - google tool, opensource, 3d-modelling
sketchup.google.com/3dwarehouse/∞ - 3D-Modelle suchen, weitergeben und speichern

blender.org∞ - Blender is the open source software for 3D modeling, animation, rendering, post-production, interactive creation and playback. Available for all major operating systems under the GNU General Public License.

building sl-objects in blender∞
A cooperative effort by several Second Life residents has, after many months of work, produced an offline app that allows SL residents to build SL-friendly objects outside the world, then import them via the scripting system.

wings3d.com∞ - Wings 3D is a subdivision modeler inspired by Nendo and Mirai from Izware.
It is possible to assign materials, vertex color, UV coordinates and textures, but there will be improvements in those features before Wings goes 1.0.

www.avimator.com∞
Avimator is an easy-to-use, open source tool for creating and editing avatar animations for Second Life.

http://www.qavimator.org/∞
andere animationssoftware

ogle.eyebeamresearch.org/∞
OGLE (i.e. OpenGLExtractor) is an open source software package by the Eyebeam OpenLab that allows for the capture and re-use of 3D geometry data from 3D graphics applications running on Microsoft Windows.