Some cool free 3D modelling applications are listed in 25 (Free) 3D Modeling Applications You Should Not Miss
TinkerCad is a modelling application that can be used in browser.
The list of 25 apps from hongkiat page.
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Blender
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K-3D
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Art of Illusion
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SOFTIMAGE|XSI Mod Tool
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Zmodeler
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TopMod3d
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Google SketchUp 6
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AutoQ3D Community – 3D Editor
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Anim8or
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Seamless3d
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BRL-CAD
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3DPlus
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3D Canvas
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eDrawings
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Blink 3D
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Minos
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freeCAD
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Bishop3D
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K3DSurf
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DesignWorkshop Lite
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GDesign 2.0
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Sweet Home 3D
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trueSpace
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Alibre Design Xpress
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3DVIA Shape