Jean-Jacques Rousseau by Christopher Bertram (Stanford Encyclopedia of Philosophy). In English.
Biography of Jean-Jacques Rousseau from Wikipedia
Rousseau the musician: life and writings (with scholarly bibliography), in French, on musicologie.org
Chronologie de Jean-Jacques Rousseau
A website in French illustrating places visited by Rousseau throughout his life, developed by Takuya Kobayashi. The site includes quotations from Rousseau, and nearly 1,000 photographs.
BnF, Bibliothèque nationale de France / National Library of France
Everything you always wanted to know about Rousseau’s writings and their publication is detailed here