Most interesting in 3D Modeling

Free
Review 2D and 3D designs without using the application they were created in
Free
Design the lighting of various areas
Create a floor plan for your home and start adding walls and textures
Free
Creates complex 3D models
It is a program that allows you to explore and visualize 3D concepts

Top rated in 3D Modeling

3D Maker
Free

Creates pseudo 3D graphical elements out of 2D drawings

ANSYS Workbench
Free

Workbench gives you access to multiphysics and systems level insights

Sunlite Suite
Free

Controls and adjusts the output of computer lighting sources

Digital Works

Design logic circuits and analyze their behavior

Mechanical Desktop 6
Free

Adds boundry reading features to AutoCAD

CADSTAR
Free

Controls and adjusts the workflow of PCB projects

3DCombine
Free

3DCombine allows you to create 3D photos and videos from 2D

BlockCAD
Free

Freeware program for building virtual models with Lego-like bricks

Screen Calipers
Free

The Screen Calipers measure anything you want on your screen

Autodesk Inventor Plug
Free

Used for viewing, marking up, and measuring .ipt, .iam, or .idw files

DesignBuilder
Free

Develops building designs in a shared environment

Trimble Geomatics Office
Free

Real-time kinematic (RTK), post-processed GPS and conventional survey data

DiagramStudio
Free

It's a powerful yet easy-to-use diagram creation tool

FreePCB
Free

Manages layers and generates PCB designs

modo
Free

Creates, edits, adds effects to 3D objects

NuGraf
Free

Advanced 3D Data Translation, Rendering & Scene Composition Software for Windows

HEC-GeoHMS
Free

Manages and imports GIS data to and from HMS

3DEM
Free

3DEM app creates 3D scenes & flyby animations from USGS, NASA, LIDAR & Global 30 Arc data

Processing Modflow
Free

PMWIN is a powerful groundwater simulation system with accompanying CD of models, documentation, and 3,000 pages of instructions

DWG TrueView 2008
Free

Excellent program for working with AutoCAD materials. It allows users to open and view files for management, editing, and updating