Responsinator - Designed to test responsive websites on different devices.
Rapid Responsive Design - Kill your artboards, design for all sizes faster
SlideRule UX Design Path - Curriculum of Online Courses To Learn UX Design
One Click Test - Tool for quickly testing your design layout in one click.
BareMetrics - SaaS Analytics for Stripe
Typewolf - Typewolf helps designers choose the perfect font combination for their next design project—features web fonts in the wild, font recommendations and learning resources.