If you are looking for the original Russian texts in FB2 format:
: This site offers a comprehensive collection of Dostoevsky's works, including novels and short stories, available for direct download in FB2 and EPUB formats.
: Hosts various multi-volume sets of Dostoevsky’s novels, including the famous Constance Garnett translations, available for free streaming and download in multiple digital formats. Academic & Biographical Resources
: Provides a structured collection of his works organized into 15 volumes, which typically includes everything from his early stories like Poor Folk to his final masterpiece, The Brothers Karamazov .
: A massive repository of free ebooks where you can find almost all of Dostoevsky's major works in EPUB and Kindle formats, which can be easily converted to FB2 if needed.
: A high-quality electronic library that hosts the 30-volume academic edition of Dostoevsky's complete works, which is considered the most authoritative version for researchers. English Language Collections