Autodesk

Free
It is an AutoCAD plugin that detects when reference files are being attached
Free
Autodesk Simulation CFD software provides comprehensive fluid flow simulation
Free
You can playback and interact with 3D files inside QuickTime
Free
It allows you to write extensions to the FBX plug-ins in a modular manner
Free
It offers specialized toolsets for game developers, visual effects artists
Free
It is a very good solution for structural engineering firms
Free
Open and browse through the contents of NWD and 3D DWF files
Free
It allows you to you can generate bridges based on user-defined criteria
Free
This service pack installs various fixes to AutoCAD Architecture
Free
It addresses a variety of issues discovered by Autodesk's internal testing team
Free
Design, model, visualize and analyze the infrastructure projects
Free
Autodesk FBX Review is a tool for reviewing 3D assets and animations
Free
You can generate timber structure for walls and roofs in Autodesk Revit
Free
It enables the definition and generation of axes grids and levels in Revit
Free
Create architectural designs and renovation plans
Free
DWG TrueView: Free application for viewing and plotting DWG and DXF files
Free
Navisworks Freedom can be used to view 3D drawings created in AutoCAD and Revit
Free
AutoCAD LT 2013 drafting and detailing software deliver a range of features
Free
DWG TrueView 2009: Free Autodesk program to view and plot DWG, DXF and DWF files
Free
It offers a set of tools for 3D design, documentation and product simulation