Khan Academy is a good resource to learn about various topics like math, science, art, computing and other useful topics. They have helpful videos that walk through different concepts in the subjects as well as questionnaires to see how well you are learning. 

Savvyroo is a tool that allows you to learn how to make connections and gives you the skills to get interviews and how to have a successful interview. 

Duolingo is a language-learning application that gives you the ability to learn another language. They offer languages like Spanish, French, and German.