Artificial intelligence (AI) isn’t just a massive scientific discipline—it’s one of the fastest growing marketplaces in tech. According to Stanford University’s AI 100 Index of AI startups, the number of active AI startups has grown fourteenfold since 2000. VC investment has grown six times over the same period.

While trailblazers such as Andrew Ng helped define the first wave of AI for the marketplace, the next class of startup founders are starting to make their mark in a much more competitive space, and with more imaginative projects that promise to deliver real-world benefits across a variety of sectors. Here are five to keep an eye on over the coming years.

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