The AT&T Natural Voices Text-to-Speech SDK (Software Developers Kit) is a speech synthesizer and software authoring program designed for use by software designers in creating applications accessible to individuals who are blind or have low vision or learning disabilities. The program can be used to create applications that speak. It is available in multiple voices, called fonts, and multiple languages. Each kit comes with one voice font. OPTIONS: Additional voice fonts; Server SDK. COMPATIBILITY: For use on IBM and compatible or Macintosh computers. SYSTEM REQUIREMENTS: 300 megaHertz (MHz) processor with Windows NT, 2000, XP, Server 2003, or Vista; Linux (Red Hat Enterprise Linux 4 or 5); or Mac OS X, Panther 10.3, or Tiger 10.4 operating system. For Windows or Linux, 128 megabytes (MB) memory with 500 MB hard drive space. For Mac computers, 512 MB memory (more when using multiple voices at the same time) and 1 gigabyte (GB) hard drive space.