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Teach English (or other language) classes online
Did you know that English speakers are in high demand in Asia? As a result many are turning to freelance English teachers using websites like Italki.com. The site is basically a virtual online classroom for freelance teachers and students. Anyone can offer lessons (and set their own price), and anyone can take lessons. From a quick scan, it looks like making $15 to 20/hour is a fair expectation.