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Pro Many models
Free 3d (previously TF3DM) is a widely popular site with almost 16 000 models to choose from.
Pro Easy to use file type filters
Free3d has very simple buttons to filter out the file types you want in your searches.
Con Difficult to find open licence models
Many models are for non commercial use, and Free3d does not presently offer any way to filter those that are for commercial use from those that are not