Most free sites have obj or fbx files that can be converted to .dae to bring inworld, with their own textures. Some does require decimating to reduce LOD, I have also at times had to use other modifiers like remesh but most converts easily just by converting to .dae with no cleanup you just need to look at it prior to uploading inworld. Hyacinth's Dingleberry Dump has lots of furniture please check it out you might find something you like.
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