Have you tried FictionFinder yet? Presented by OCLC, you can search this database of fiction by character, locale, title, author, and more. You can also browse the various categories. Browsing to "Dystopias" (the opposite of Utopias), I find 116 records that fall into this fiction category. Clicking on any of the titles, like Brave New World, takes me to the item record with hyperlinked and searchable fiction categories and subject headings.