Last May my students helped me assemble a video showcasing Membean, a comprehensive English vocabulary trainer that we've used at Brophy for the last three years. My sophomores train 45 minutes per week, and my juniors train 60. Since students are the end-user, they often find bugs or identify ways to improve the product. The CEO of Membean has told me numerous times that the students' feature requests have shaped the way the product has improved over the years. Close working relationships with edtech companies like Membean have made me excited to integrate productive tools into my teaching.
UPDATE 26 May 2015: Membean featured this video in their Teacher Spotlight.