Icons8 - Free app for Mac & Windows already containing 39,800 icons. Allows to search and import icons…
Studyum 3D icons - 28 trendy customizable 3D icons for any e-learning product
Iconscout - Design Resource Marketplace.
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Craftwork - A collection of User Interface resources made by Craftwork
ICONZ - ICONZ is a premium icon library that offers more than 70 unique icons for all your products.