libxslt is an XSLT processor based on libxml2.
Official releases can be downloaded from https://download.gnome.org/sources/libxslt/
The git repository is hosted on GNOME's GitLab server: https://gitlab.gnome.org/GNOME/libxslt
Bugs should be reported at https://gitlab.gnome.org/GNOME/libxslt/-/issues
Documentation is available at https://gitlab.gnome.org/GNOME/libxslt/-/wikis
The build system is similar to libxml2. Refer to libxml2's README for build instructions.