libxslt, an XSLT processor based on libxml2:

• https://en.wikipedia.org/wiki/Libxslt

• https://gitlab.gnome.org/GNOME/libxslt

  • https://github.com/GNOME/libxslt

• https://github.com/winlibs/libxslt

• http://www.xmlsoft.org/libxslt/index.html

xsltproc, command line XSLT processor:

• https://gnome.pages.gitlab.gnome.org/libxslt/xsltproc.html

• The xsltproc tool: http://xmlsoft.org/libxslt/xsltproc2.html

• https://community.chocolatey.org/packages/xsltproc

• Installing xsltproc: https://sagehill.net/docbookxsl/InstallingAProcessor.html#InstallXsltproc