Github icons created by Pixel perfect - Flaticon

Gmail icons created by Freepik - Flaticon

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Atcoder Icon - Atcoder.jp

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Python icons created by Freepik - Flaticon

Coding icons created by Freepik - Flaticon

Git icons created by pocike - Flaticon

Swift icons created by Fathema Khanom - Flaticon

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Firebase icon allowed use by Firebase

Html icons created by Freepik - Flaticon

Css3 icons created by popcornarts - Flaticon

Javascript icons created by Freepik - Flaticon