Here are two vector Macbook 2015 mockups released as PSD and Sketch formats by Miroslav Rajković and Maximlian Hennebach.
A set providing some UI elements created with Sketch app. Freebie designed and released by Piotr Kwiatkowski.
UI kit for Sketch
Here is WhatsApp design concept for OSX designed with Sketch app. A freebie designed and released on dribbble by Roman Kornikow.
WhatsApp OSX concept – Sketch
Tonicons is a CSS-ready font providing 200 outline icons. In the package you may find .EPS 8, .SKETCH and a webfont.
Tonicons – 200 outline icons
Vicons is a set including Victor Erixon’s 60 icons for Sketch. Freebie released by Alexander Slash.
Vicons – 60 Sketch icons
Subway is a (now free!) set of 306 pixel perfect crafted icons. Delivered in PNG, SVG, XALM, PSD, CSH, SKETCH, PDF, AI and EPS formats.
Subway – 306 icons now free!
Here is the Google Inbox user interface created with Sketch app. Freebie released by Erika Ito.
Google Inbox UI
A really useful and complete Yosemite UI kit created with Sketch app. Freebie released by Keir Ansell.
Yosemite UI kit – Sketch
The Android Lollipop UI kit created with Sketch app. It contains 45 useful elements. Created by Jerry Cao.
Android Lollipop UI kit
Tethr UI kit for iOS is now available for free! It’s got over 250 of the most common UI elements to make prototyping that much faster.
