NuTube is a tool that classifies the most recent YouTube videos based on user queries and groups similar videos into playlists. It uses an algorithm that counts and weighs the appearance of words in video titles, subtracts common words, ranks the remaining words, and clusters them based on co-occurrence to group related videos. The tool is built using stopword filtering, CSS, JavaScript, and supports Chinese queries. It was created by Jingjing Huang, a Caltech graduate with a PhD in Math.