This website provides a diverse selection of free image downloads, and there are also some paid image libraries available for purchase. Rarely, there is a categorization function which is uncommon among other free image library websites.
Category: Design Materials
Mock Up Zones
The website "Mockup Zone" on behance provides many business image templates including PSD files that are available for download and application.
Vray Materials
When creating 3D, you need to put textures on 3D objects to render a realistic image. Vray Materials provides a lot of texture materials for download and use.
Moveast
A foreign person, just like Jiejie, releases their own photos that they have taken, allowing everyone to download and use freely. Although the quality of the photos is not very high, they are definitely sufficient when used on websites.
Pixeden
A website offering templates and UI downloads, and even plugins, with a clean and user-friendly interface.
UI Cloud
A massive UI component database with over 50,000 different styles available for free download.
Seeklogo
This website collects various logos from companies around the world, and also provides vector files for download to facilitate design reference and use.