New York Real Estate Institute, New York

Since the company’s inception in 1987, more than 100,000 students have earned certification or bolstered their earning power at NYREI. Graduates including Donald Jr., Ivanka, and Eric Trump have made their way through the flexible schedule of courses for aspiring Realtors, small-business owners, and freelancers of all stripes. Besides licensing courses for real-estate brokers and salespeople, the school offers more than 50 programs. The sessions include investor training, workshops on LEED accreditation, and one-on-one tutoring. Those stuck at home, in the office, or waiting at a glacier crossing can still take steps to further their careers with a large selection of online classes.