Brainstate is described as 'mobile application available on iOS created to help with meditation, relaxation, sleep, and studying. Although originally created as a school project to help students reduce stress and anxiety, it is not limited to students. Binaural beats can be used by all ages' and is an app in the Sport & Health category. There are six alternatives to Brainstate for Windows, Android, Mac, Linux and Windows Mobile. The best alternative is Gnaural, which is both free and Open Source. Other great apps like Brainstate are Lulaj 1 (Free), BrainWave Generator (Freemium), Sleep & Binaural Beats (Free) and Android Binaural player (Free, Open Source).
Gnaural is an open source programmable auditory binaural-beat generator, implementing the principle described in the October 1973 Scientific American article "Auditory Beats in the Brain" by Gerald Oster.
Lulaj 1 nonverbal is an app "you have to have" as it offers you support in your everyday life trough isochronic and binaural tracks! It lets you play selected sound waves and specific impulses to improve your brain activity in certain frequencies.
BrainWave Generator is a brain wave stimulation software that generates tones with binaural beats. Effects of brain stimulation range from relaxation and meditation to self-hypnosis and alleviation of headaches and migraines.
Binaural player is an Android application to generate binaural beats. It is based on SBaGen by Jim Peters. It is released under the terms of the GNU GPL version 2. The source code is available from Gitorious.