On the Iconscout website, there is a free design icon material that provides vector format SVG files for download and can even be embedded into websites using a font. Currently, it is available for free download for everyone and the copyright belongs to the use of the Apache 2.0 license, which means that the source of the material, Unicons, should be marked when using it. The material has accumulated more than 4,000 very design-oriented icons, with more than 20 categories. If you can't find the icon you want, you can also write to them and ask them to design it for you. Additionally, you can also subscribe to the service through a paid subscription, which allows you to use the icons without having to mark the source, the cost is around $13-$15.