Revolutionary calendar – There are multiple sites in English and French that explain the system of the revolutionnay (or republican) calendar. In addition to wikipedia.org, here are some links:
Calendrier Republicain (in French)
http://www.gefrance.com/calrep/calen.htm (in English and French)
http://www.kokogiak.com/frc/default.asp (in English)
Premier Empire – Napoleon 1er – A summary of Napoleon’s life and his legacy on France history.