I use the following tools in my work:
Lightwave 3D from Newtek
Lightwave has been my workhorse for a number of years. It has
(arguably) the best polygon modeller and renderer on the planet.
Photoshop from Adobe
For still 2D work.
Combustion from discreet
For compositing and effects work on image sequences. This
is a highend PC based compositor building on the technology from discreet's
line of highend SGI products like Flame and Inferno.
Maya from Alias/Wavefront
We use this at AnimagicNet for character animation.
Renderman from Pixar
The famous rendering software. Or really not. Renderman
is actually an interface standard for interfacing between modeller/animation
software and rendering software. It is thus NOT a renderer.
There are however Renderman compliant renderers such as Pixars PRman and
the freeware renderer BMRT.