Even though I write it in 99% of my deviation descriptions, about three times a week I get comments, notes or emails asking what tools I use to create my work. Maybe this will help, but if people aren't reading the descriptions, it's difficult to believe they'll read this either. I hope this answers your questions as it's pretty detailed.
For Most 3D modelling:
I use 3D Studio MAX from Autodesk. - http://www.autodesk.com/products/autodesk-3ds-max/overview I've been using 3D Studio since rel.2 running on DOS. long before it was "Maxxed". It's my go-to 3D application for modelling and rendering.
For complex, detailed and accurate mechanica