Alml is a SGML typesetting system born for a big Italian documentation project, but it might be used also for other purposes.
Alml documentation is written in Italian language and it might be reached at http://a2.swlibero.org/alml.html, and many other sites where "Appunti di informatica libera" is distributed.
Up to date informations might be found at http://a2.swlibero.org/~daniele/software/alml/.