Tetrisly - Starter kit for design systems and wireframes builder (Sketch/Figma)
Anthony Boyd Graphics - Anthony Boyd Graphics is the fastest-growing platform that offers high-quality and advanced level mockups, textures, 3D models, and UI kits for free to help designers to save time and effort.
Material Design Icons - 750 Free open-source glyphs by Google
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
React Rainbow Components - Build your web application in a snap.
Pixeden - Pixeden is an all-in-one premium design and web resources platform that provides high-quality graphic design templates and lots of other files.