PredictionIO, a startup that has crafted an open-source program developers can use to add machine-learning smarts into their applications, might just be the setting the tone for the next wave in data technology. More than 4,000 people have shown interest in the project by giving it a star on GitHub, hinting at its merit among open-source initiatives. Now investors have thrown $2.5 million at PredictionIO, meaning that development and commercial support of the project can continue. AlchemyAPI, Skytree, Wise.io, and other startups with easy-to-use machine learning services or application programming interfaces have also gotten funding in the recent past. But PredictionIO stands out from those, and not just because it’s free.