Freepik: provides a large number of free vector graphics, icons, backgrounds, illustrations and photos, suitable for graphic design, web design and illustration.

Jusoutu: a website that provides ps materials.

Unsplash: It is a high-quality free photo sharing platform, which provides a large number of free photo materials and is suitable for various design projects and creative applications.

Pexels: It is a free photo and video material library, which provides high-quality free photo and video materials and is suitable for various design and creative projects.

Pixabay: It is a comprehensive free material library, providing photos, illustrations, vector pictures, videos and other materials, suitable for various design and creative applications.

Flaticon: It is a website that provides free icon materials, including vector icons and icon sets, and is suitable for web page design, application development and UI design.

Vecteezy: provides a large number of free vector graphics materials, including illustrations, icons, backgrounds, textures, etc., suitable for graphic design and illustration.

Please note that when using these free materials, be sure to check the license and requirements of each website to ensure that you comply with the relevant authorization and terms of use.