Designmodo is an all-in-one solution to create website and email newsletter designs that impress and engage your audience. Create your email templates and websites 20x faster, with no design limitations and no need for coding skills. Postcards email buidler provides you with all the tools necessary to start building and customizing your email template - from scratch to the finished product in just a few minutes. Collaborate with the entire team to bring ideas to the table from everyone.

Sketchsheets is an open source project dedicated to providing free printable templates of the latest devices and platforms for wireframing designs.

Craft is a suite of free plugins for Sketch and Photoshop to help you design better and faster from your design environment. Grab off the shelf assets, build rapid prototypes, and sync to InVision Cloud to share and collect feedback.

Gravity Wireframe Kit is a collection of UI elements and common layouts so you can wireframe faster in sketch.