Essentials icon pack, from InVision
Essentials is a free icon pack of 140 free icons released by InVision. They come in 2 flavours: UI Icons for any application, and Business icons.
Free Sketch App Resources
18 Free office icons (SVG + Sketch formats)
A free set of 18 free vector icons designed and released by Gunaldi and provided as SVG and Sketch file formats.
Free portfolio landing design template
A free portfolio design template made of sections (works, about, links) and including a contact form at the bottom of the page for receiving work inquiries.
Free Pixel 3 XL mockups
Free Pixel 3 XL mockups available in PSD and Sketch formats. Super-useful to present your android apps into the latest Google’s smartphone.
75+ Free baseline icons
A set of 75+ free vector icons designed and released by Luboš Volkov. Icons fit a 25x25px canvas and come in outline and glyph styles.
Movie booking app concept
Here is a nice a starter UI kit for Sketch for getting started with a movie booking apps designed and released by Kishore.
Font Combinations Library
Font Combinations Library (aka Font Combinations Kit 2.0) is a great set of 8 different font combinations meant to help speed up your design process.
Tourex: Flight booking app design template
Tourex is a free flight booking app design template designed in Sketch and Adobe Xd and released by Nasir Uddin.
Shards Dashboard Lite: A ready to use dashboard template
Shards Dashboard Lite is a free and ready-to-use admin dashboard template built on the top of Bootstrap 4 that comes in SCSS and Sketch files.
Coffee app design template for Sketch
A pretty nice design concept for a coffee app designed and released by Eman Tawfik. Freebie is made of 6 ready-to-use Sketch artboards.