Libxslt is the XSLT C library developed for the Gnome project. XSLT itself is a an XML language to define transformation for XML. Libxslt is based on libxml2 the XML C library developed for the Gnome project. It also implements most of the EXSLT set of processor-portable extensions functions and some of Saxon's evaluate and expressions extensions.
This installer guides you through the steps necessary to install libxslt 1.1.26 for Mac OS X. To get started, click Continue.