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The League of Moveable Type is a community of font designers and creators who license their collection of fonts under the SIL Open Font License and host their source files on GitHub.
FontSpace is a font download website where you can filter fonts that fit your needs which are available under an open license.
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Vivid.js is focused on software developers. Vivid.js is a dynamic SVG icons library that is designed to give life to website designs by using html5 data attributes. Vivid.js SVG Icons ca can be download and customized as per needs in different designing software like Photoshop and Sketch as well. They provide clear documentation on their GitHub page and you can follow their guide step by step.
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