Learn and Master by Legacy Learning Systems offers educational courses for guitar, piano, drums, painting, dance, and photography.
eBay is an online marketplace where companies and individuals can sell new and used items, or bid against each other on buying those items.
Adobe provides software for creatives, including graphic designers, video editors, and photographers. Their Creative Cloud software is industry standard.
Mister Art is the world's first online art supply store, having opened in 1996. They offer supplies for painting, sculpting, photography, scrapbooking, mixed media, and more, for all artists.