I've just released the first version of my ambient sound app for Mac. You can read more about it and download it here. It creates a variety of ambient soundscapes and can act as a sleep aid, or help with focus while working.
MelloToneGen is a generative ambient music and noise machine application for OS X.
Built with Max/MSP, it runs as a native Mac application, and creates soothing, meditative soundscapes, using sounds of nature recorded in the Pacific Northwest, along with algorithmically-generated synthetic tones.
You can choose from multiple soundscape themes, created from layers of original field recordings. Along with that, mellow tones are generated, that evolve over time (especially enjoyable on headphones).
Having a non-repeating source of ambient sound can be beneficial in many situations. Focusing on work or creative tasks in a totally quiet space can be difficult. Similarly, it's hard to concentrate when listening to music with melodies or lyrics. MelloToneGen aims to strike a balance by providing more than just white noise, and avoiding melodic repetition.
MelloToneGen sounds best over good headphones or speakers. Put it on while programming, drawing, meditating, doing yoga, or use it as a sleep aid...the name is in part a reference to Melatonin.
Please contact me with any feedback or issues.