ui typography Dirtyline Studio (dirtylinestudio.com) A lot of very useful art and UI design resources, along with some freebies
ui typography FontShare (fontshare.com) A collection of fonts 100% free for personal and commercial use.
color art ui Material UI (materialui.co) A huge collection of UI, Material and Social platform colors, along with icons, unicodes and more.
icons ui typography FontAwesome (fontawesome.com) A huge icon library and toolkit, used by millions of designers, developers, and content creators.
programming gamedev unreal ui ben ui documentation (benui.ca) Unofficial Unreal Engine documentation on specifiers and others.
game design gamedev ui Interface In Game (interfaceingame.com) Explore a collection of video games interfaces, screenshots, and clips. Take a look at all the fragments that make up a video game, and find inspiration for your designs
game design gamedev ui Game UI Database (gameuidatabase.com) Built to aid in the discovery of new inspiration, and to provide a fast and efficient way of searching for reference materials.
icons ui Material Design Icons (material.io) Five sets of stylized system icons, available in a range of formats and sizes.