This site will look much better in a browser that supports web standards, but it is accessible to any browser or Internet device.
SonicBirth is now completly free. Version 1.3.0 is not, however, compatible with plugins created by older versions.
Make sure you read the installation instructions, and the documentation, which is available from the main application using the Help menu.
SonicBirth requires MacOS 10.3.9, QuickTime 7, and any host application that supports the AudioUnit or VST plugin format.