You might not think of freelancing as a business, but with more and more companies turning to part-time contract workers to fill their skill gaps, it's not hard to imagine making a living providing businesses with a variety of freelance services. Depending on your skill sets, you could work for multiple companies in a variety of fields, offering flexibility and a refreshing change of pace. According to the freelance job listing website Freelancer, tech services, content creation and web design are popular fields for contract work.