http://www.attalus.org/index.html
http://www.lieberknecht.de/~prg/calendar.htm
http://calendriers.irht.cnrs.fr/calscope.htm
http://www.smart.net/~mmontes/ec-cal.html
http://web.meson.org/calendars//
http://www.gefrance.com/calrep/
http://millesimo.irht.cnrs.fr/
http://www.medievalist.net/calendar/home.htm
http://www.web40571.clarahost.co.uk/roman/front.htm
http://www.softhawkway.com/rcalc.htm
http://www.manuscripta-mediaevalia.de/gaeste/grotefend/grotefend.htm