The website Bacdefrancais.net offers a wide variety of French literature online for free. It’s mainly aimed at French students who are in their last year of secondary school, so it’s only suitable for advanced foreign language students. This website has literature stretching from the 4th century through the 20th, and offers the opportunity to read authors like Victor Hugo, Voltaire, and Moliere in their original language. Some of the works also have audio attached to them. There are a couple of French translations of works which were originally written in English, but the overwhelming majority of the authors are French. If you’re looking for a good site for sentence mining, or just casual reading in French, this might be worth taking a look at.
Histoire de la littérature française – Written in French, this website tells the story of French literature from the Middle Ages to the 20th century.