http://www.milkshape3d.com/ Milkshape 3d site not only has a great modelling animation program for extremely cheap, they have an impressive list of plugins for it that allow users to import and export major 3d design packages including Autodesk max, Maya, lightwave, etc.. and a small army of plugins for import/export to all the popular game engines, check out the list of games you can import models from/ export models to!
http://developer.nvidia.com/page/tools.html Nvidia has some really awesome tools to help modders too! especially those interested in getting more into programming for things like shaders and graphics scripting. Animate textures, layer and bake textures together, dynamics morphing etc... as well as a cool plugin available for the latest versions of max and maya to allow the use of DDS files as textures.