Sketch Template Files
AppNexus Sketch Template
I was the first adopter of Sketch at AppNexus, and I decided to evaluate it by re-building some of our interaction elements. This, accidentally, lead to the creation of our template file. Since then I've been in charge of maintaining it and encouraging contributions from team members. I've recently started going through and rebuilding elements following best practices.
iMessages App Icon Template
I created an iMessages sticker app recently and couldn't find a great template for building the icons. As such, I built my own. It's been downloaded about 750 times already.