Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Uxcel - The easiest way to learn UX/UI design
Issuu Collaborate - Issuu Collaborate offers a way for teams to work together on creating content for publishing.
UX Challenges - Done reading about UX? Start doing it.
Moovweb - Moovweb makes the web instant and simple.
UI Coach - Become a better UI designer in 30 days