ConTeXt (Typesetting System)

“a system for typesetting documents based on TEX and METAPOST. You can use this system for converting documents coded in TEX format as well as documents coded in XML into high quality PDF” (http://www.pragma-ade.nl/)

ConTeXt gives the user ways to control macro- and microtypography directly. It thus differs from LaTeX which shields the user from these settings.