Free 3D Models

• Sketchfab
• CGTrader
• Gumroad
• TurboSquid
• 3DFindIT - Industrial, parts
• 3D Model Database - Slow but lots
• NASA 3D Models - Space
• 3DExport
• BlenderKit Free Models - BlenderKit Plugin
• SketchUp 3D Warehouse - Import Plugin

Blender Assets

• Blender Market
• Blender Add-ons
• Blender Geometry Nodes

3D Gaming Models

• Unity Asset Store
• Unreal Engine Marketplace

Free 3D Print Models

• Yeggi
• Printables
• Thingiverse

Misc Free

• Mixamo - Rigs/animates custom characters easily, lots of animations
• Embergen Free VDB Packs - Clouds, tornadoes, fires