CGTips - CGTips is a 3D Architectural Visualization learning platform for Architects or interior designers to build their skills in an interactive way.
Poly Haven - Poly Haven (formerly known as Texture Haven) is an online website where you will find scanned textures without any cost and that are of high quality.
Sketchucation - Sketchucation is a 3D SketchUp Community for students, professionals, designers, and hobbyists.
Textures.com - Textures.com is a website that offers digital pictures of all sorts of materials.
TheSketchupEssentials - TheSketchupEssentials is a community to get SkethuUp tutorials and help from professionals.
Open3dModel - Open3dModel is a library of millions of 3D assets and models for 3D printing, virtual reality, augmented reality, computer graphics, scientific visualization, and more.