You can find many works by French authors (except for those working in the 20th-21st centuries) in full-text on the Internet by searching on the author and title. BUT you must be cautious about authenticity and accuracy. Always ask these questions:
- What is the original source of this text?
- Is the website from an individual, a scholarly society, or other organization? What are their standards for accuracy?
These databases and websites are are more reliable: