Alpha-Beta NeuroFeedback
This uses the Muse headband (Muse 1, Muse 2, and Muse S) in tandem with the Mind Monitor (iPhone, Android, Amazon Fire) to give you real time neurofeedback with Alpha and Beta frequencies. This uses "Full Quadrant Peaks" So you'll be training your brain to produce alpha in all four quadrants and reduce beta in all four quadrants. It also has settings to progressively increase your alpha to higher and higher levels. Instead of just letting the user know they are creating alpha, it will tell them how much, using sound. And that amount can be adjusted to progressively increase the amplitude.
This app doesn't tell you specific frequencies, just general alpha (8-12 Hz) and beta (12.5 and 30 Hz). It also gives you an adjustable scroll graph to see all the bands (delta, theta, alpha, beta, gamma), as well as front to back and left to right ratios. Everything is described in the tutorial video.
tutorial video: https://youtu.be/GEwvpJ0KvoY
Research about Alpha: https://www.sciencedirect.com/science/article/abs/pii/S0010945215001033
Mac Version + Audio Samples