Creativebug offers thousands of online arts and crafts classes.
LinkedIn Learning offers thousands of classes on technology (writing code, web and software development), business and marketing (Excel spreadsheets, anyone?), graphic design, photography, music lessons, audio production and more!
From American Sign Language to Zulu, you can learn a new language from Transparent Language Online. Includes English as a second language, and many languages can be learned from a native Spanish speaker basis.
Pronunciator is a fun and free way to learn any of 98 languages with personalized courses, movies, music, and more, on your desktop computer or mobile device! Not available for all library card types.
Kanopy has Great Courses and Princeton Review classes among its video offerings.