YayText! - 𝓢𝓾𝓹𝓮𝓻 𝓬𝓸𝓸𝓵 𝓾𝓷𝓲𝓬𝓸𝓭𝓮 𝓽𝓮𝔁𝓽 𝓶𝓪𝓰𝓲𝓬
Base UI Sketch Framework - Huge set of everything you need to design and prototype
Sketch Extensions - An official collection of Sketch extensions & plugins
Type Foundry Index - Making type foundries easy to find.
Rawson Framework - Create amazing Sketch apps for iOS
Icon Slate - Icon Slate lets you easily compose, import and export desktop icons in many formats.