http://eblong.com/zarf/boodler/index.html

What Is It?
Boodler is a tool for creating soundscapes — continuous, infinitely varying streams of sound. Boodler is designed to run in the background on a computer, maintaining whatever sound environment you desire.

Boodler is extensible, customizable, and modular. Each soundscape is a small piece of Python code — typically less than a page. A soundscape can incorporate other soundscapes; it can combine other soundscapes, switch between them, fade them in and out. This package comes with many example soundscapes. You can use these, modify them, combine them to arbitrary levels of complexity, or write your own.

In order to run Boodler, you will need:

* Boodler and the Boodler sound library. (See below. Yes, the sound library is huge. Sorry. I wanted a wide range of sounds, at a non-sucky quality.)
* MacOSX, or a Unix computer with sound hardware and the OSS or ALSA sound drivers, or an ESD library. (Tested on Mac, Linux and FreeBSD.) (I also have donated source patches for Windows with your choice of DirectSound or WaveOut.)
* Python 2.3.5 or later. (I am currently distributing Boodler only as source, which means you need to be able to run Python and build software for it. That is, you need the Python development include files.)

Audio example:
[audio:http://eblong.com/zarf/boodler/samp-highway.mp3]