Free (often with ads or limited selection):
* Project Gutenberg: A massive archive of public domain books. Expect older works, but a huge variety.
* Open Library: Similar to Project Gutenberg, but also includes some newer works and allows you to borrow ebooks digitally.
* ManyBooks: Offers a large selection of free ebooks, with a mix of genres and authors.
* Internet Archive: A digital library with a vast collection of books, movies, software, and more. Many books are available for online reading.
* Wattpad: Primarily a platform for user-generated stories, but you can find some published works and serialized novels here.
Subscription Services (require payment):
* Kindle Unlimited (Amazon): Offers access to a vast library of ebooks for a monthly fee.
* Scribd: Provides access to ebooks, audiobooks, and other content for a monthly fee.
* Kobo Plus: Similar to Kindle Unlimited and Scribd, offering a wide range of ebooks for a monthly subscription.
* Google Play Books: While you can buy individual books, they also have a subscription option for access to a selection of titles.
* Oyster (defunct): This service is no longer active.
Publisher Websites:
Some publishers, particularly those specializing in self-published or independent authors, may offer free or paid online access to their books directly through their websites.
Library Websites:
Many public libraries offer access to ebooks and audiobooks through online platforms like Overdrive or Libby. You'll usually need a library card.
Important Note: The legality and accessibility of online books vary widely. Always ensure you're accessing content legally, either through free public domain works or through authorized subscription services or purchases. Be wary of websites offering pirated material.