Designlab - Learn design by doing, with hands-on projects & mentorship
Visily - The easiest and most powerful wireframe software for agile teams.
Product Disrupt - A design student's list of resources to learn Product Design
PSD to Sketch Design Converter - Convert a Photoshop design to a layered Sketch file for free
Zeplin - Collaboration app for UI designers & frontend developers
Invision - Prototyping and collaboration for design teams