Biography.com: Condorcet: Brief entry on this French thinker.
Condorcet: Brief profile with portrait and extensive links, from the New School's History of Economic Thought.
Condorcet: The Future Progress of the Human Mind: An excerpt from the work which Condorcet wrote shortly before his death.
Marie Jean Antoine Nicolas de Caritat Condorcet: Article from the MacTutor History of Mathematics project, by J.J. O'Connor and E.F. Robertson. Portrait and a concise review of his intellectual career.
Wikipedia: Marquis de Condorcet: Lengthy article from this openly-edited encyclopedia.