The official Lumion list of texture collections

Credits: The Lumion team and other Lumion users

Lumion version: All versions

Textures from Poliigon.

Please note: Act-3D B.V. does not imply any warranty or recommendation of the following assets.

* HDRI resources: Lumion does not currently support HDRI for lighting information. You use HDRI images for wide-area panoramic background images etc. Convert an EXR 32 bit file format to JPG.

1. Image and texture collections

Poliigon: Large collection of high-resolution photo-realistic textures, some of which are free. The Normal Maps need to have the green channel (Y) flipped as they use OpenGL and not DirectX. In Lumion 2023 and newer you can do that directly and easily within the Material Editor for a Standard Material.
Quixel Megascans: Scanned and textured objects. Well known. Over 13500 resources, 50 free, rest by subscription. Covering a wide range of subject matter, surfaces, and collections.
Arroway Textures: Large collection of scanned high-resolution photorealistic textures. Extremely high quality.
Substance Source: Large collection of high-resolution photo-realistic Substance materials for use in Adobe (Allegorithmic's) Substance Designer tool. Substance Source Collection.
Textures.com: Images and textures, free for certain resolutions and daily download limits, wide range, and good quality.
Poly Haven: Free (or support as a patron) CC0 licensed, textures up to 8K. Maps for full PBR materials
HDRIHaven: Free (or support as a patron) CC0 licensed textures, textures up to 8K, some at 16K (but use a max of 8K). Maps for full PBR materials.
Renderhub: Marketplace for Textures (about 2500) and 3D models. Pay and free. Also DAZ models.
3DTextures.me: Free seamless PBR textures. CCO license. Currently about 1200 textures. Free seamless PBR textures with Diffuse, Normal, Displacement, Occlusion, Specularity and Roughness Maps. Patreon support but not required. Download is one file at a time from a GDrive. Scan after download. For Tier 3 Patrons, there’s a 4K resolution uncompressed PNG version of this texture. There’s also SBS/SBSAR files (Substance source files) for texture customization.
DiscoverTextures: About 300+ images (Nov 2015). Free for use in both personal and commercial projects.
Architextur.es: Textures (about 100) are free to be used in any derivative works, both for personal and commercial use, but may not be redistributed.
VIShopper: Collections of free and pay for resources; including 2D cut-out people, plants, skies, backgrounds, ground textures.
TextureMax: You need to register and are limited to 5 free 512x512 pixels textures a day.
MaxTextures: Some very high-resolution seamless textures.
SketchUp Texture Club: Four categories of textures. Same resource site as Sketchup Texture.
Artem Lebedev: 30 PBR textures: Donationware. Pay as much or as little as you want.
RD-Textures: Real Displacement Textures.
VIZPARK: Textures and tiles plus an Omnitile plugin tool for 3ds Max.
CG Bookcase: Free Creative Commons Zero textures.
ShareTextures: Patron based subscription, no free. About 770 textures to date.
Architextures: A simple way to make your own seamless textures with different patterns. Need a Pro account to get all options. Choose a pattern, a material type for example wood or stone, the joints and joint type, etc.
Texturify: Collection of photo based imagery with textures for roads, brick, stones, metal. nature, rocks, etc. Free for commercial use, see Terms of Use and give credit.
TextureCan: 550+ Free PBR Textures (CC0 Textures). Based from Substance Designer. Ads support the site and downloading.
a23d: Vast range of 60,000+ PBR Textures and Decals. Requires an account.
CleanPNG: General graphics resources, but with PNG alpha transparent backgrounds.
ambientCG: Public Domain Resources for Physically Based Rendering. Over 2000 resources. Creative Commons CC0 1.0 Universal License.
DesignConnected: 259 CG Materials from 4 categories. Available for download in 3ds Max and other 3d file formats. Commercial.
Lightbeans: Over 2400 textures at 1K, 2K and 4K, including some brand manufacturers . Maps include: Diffuse (Color Texture), Displacement, Gloss (do not use, use Roughness Map), Normal (8bit), Reflection, Roughness. Do not use the OpenGL maps, use DirectX maps only.

2. 2D people and cut-outs

Humano2D: Every person. in Every light. Every perspective. However they may all include the shadow which is not needed for realtime 3D rendering in Lumion that creates the shadow based on the current Sun position in your Project.
MrCutout: Various sets of freebies, 2D people, 2D vegetation, 2D vehicles etc.
FreeDeeLab: Various sets of freebies, 2D People cutouts, some 3D models, note on links to resources in Freebies: "Files to download (please read usage rules in posts)".
Viz-People: Selection of people, children, animals from their sold collections.
Got3d: Free lower resolution already masked people images and reasonable cost 2D people resources to build your own 2D Billboard Library in Lumion.
Architextures: All cutout figures (about 90) are freely available under a Creative Commons license. About 50% at full size seem low quality/sharpness.
VIShopper: Collections of free and pay for resources; including 2D cut-out People, Plants, skies, backgrounds, ground textures.
Case3D: 200 free 2D cut-out people - 6GB in total!
Just Not the Same: 80+ collection, commercial and some non-commercial. Mostly back-facing. Men, women, couples, groups.
Escalalatina: A large collection with a focus on Latin Americans. Big collection, including some animals.
Nonscandinavia: Collection of diverse entourage from around the world. However, most images have not been licensed for commercial use.
Clipped.io: Large collection. People, animals, vehicles. Web site allows selection also on perspective view of cutout.
Diaz Paunetto: High resolution, small collection, PNG and PSD formats.
Tony Textures Free Set: Free Set of People Cutouts - PNG and PSD as single downloadable file. Sampler to their other resources.
Epictor: People, silhouettes etc.
Brightman Design (USA): 2D people collection.
Skal Gubbar: Cut out people by Teodor Javanaud Emdén.