This feature is new in the Solaris Express 9/03 release and in the Solaris 9 4/04 release.
The Standard Type Services Framework (STSF) is a pluggable object-based architecture that allows users to access typographically sophisticated text layout and rendering. The pluggable architecture of the framework gives users the ability to use different font rasterization engines and text layout processors to achieve the desired visual representation. The pluggable architecture also manages fonts and enables application-specific fonts to be created. STSF includes both a standalone API and an X server extension to handle rendering on the server side for improved efficiency. STSF is an open source project that is sponsored by Sun Microsystems.
For more information about the project and how to use the API, see http://stsf.sourceforge.net.