For Android Created by Russell Eric Dobda Guided Meditation Treks
This is the core of the "Binaural" application, created by Russell Dobda in 2016 That was my first ever android app, and it generates sine waves to be used for binaural beats.
This sample app is a cut-down version of that, which includes the core engine to create binaural beats.
Some background on the algorithms can be found here http://www.gunkyfunky.com/blog/open-source-binaural-beats
The production app can be found on the Google Play store at https://play.google.com/store/apps/details?id=com.guidedmeditationtreks.binaural
There is also an iOS app with the same name, which does the same thing https://itunes.apple.com/us/app/binaural/id958442825?ls=1&mt=8
If you use any of these algorithms in your own binaural beats app, it would be cool to get a shout out!