Whimsical Wireframes - Lightning fast wireframing with real-time collaboration.
Practice.dev - Practice programming for free
Adobe XD - Adobe XD is an all-in-one UX/UI solution for designing websites, mobile apps and more.
PrepBootstrap - Bootstrap themes, templates & widgets with code examples
Userflows - Automatically generate user journeys
Programming Hero - Personalized, fun, and interactive way to learn programming