SILE is a typesetting system; its job is to produce beautiful printed documents.
Conceptually, SILE is similar to TeX—from which it borrows some concepts and
even syntax and algorithms—but the similarities end there.
Rather than being a derivative of the TeX family SILE is a new typesetting and
layout engine written from the ground up using modern technologies and borrowing
some ideas from graphical systems such as InDesign.