3D Modeling

SketchUp Pro
Easy, fast 3D modeling compatible with Google Earth

Rhino
Restrictions
This trial version is completely function, it even allows you to add plug-ins. The limitation is in the number of times you can use the save option, a total of 25 times.

MilkShape 3D
Restrictions
30 day trial period.

AutoCAD
Note
- Input formats: DWG, DWS, DXF, DWT, DGN.
- Output formats: DWG, DWS, DXF, DWT, DGN, DWF, DWFX, WMF, SAT, STL, EPS, DXX, BMP, PDF.
Restrictions
Trial version works for 30 days

3DField
Restrictions
Does not print 3D representations.

AC3D
Restrictions
14 day trial version.

Bixorama
Restrictions
The trial version add as watermark.

BodyPaint 3D
Restrictions
15 days trial version

Euler 3D
Note
although the program is free, no limit on the author's website you can enjoy it without the need to register.