SocialSizes - Sketch templates for sharing images & videos on social media
Mattermark Daily - A curated newsletter of blog posts from investors & founders
Social Templates Bundle for Instagram - Large bundle of 240 posts & stories templates for Instagram
Startup Quote - Awesome founders provide wisdom about making things
Branded Templates By Visme - Visme brings harmony to brands through an intuitive all-in-one platform to create, collaborate and communicate any type of beautiful content in less time.
Snapstorms - An archive of advice from Mark Suster on Snapchat