There are several ways to access free books online. Here are some popular methods:

1. Project Gutenberg: Project Gutenberg is a digital library offering over 60,000 free eBooks. These books are primarily older works where copyright has expired, so you’ll find a wide range of classic literature and older non-fiction titles.

2. Open Library: Open Library is another online resource that provides access to millions of free eBooks. You can preview books, borrow them for a specific period, or create an account to borrow books without restrictions.

3. Librivox: Librivox offers free audiobooks of works in the public domain. The audio recordings are created by volunteers, making it a great resource for classic literature and older texts.

4. ManyBooks: ManyBooks hosts thousands of free eBooks in various genres. You can search by author, title, or browse through categories. The site offers books in different formats like EPUB, Kindle, and PDF.

5. Internet Archive: Internet Archive is a vast digital library that includes books, movies, music, and more. It offers access to millions of books, including older titles and rare collections.

6. Free eBook Websites: Several websites curate collections of free eBooks, such as Free-eBooks.net, BookBub, and BookBoon. These platforms offer a mixture of public domain titles and newer books made available for free by authors or publishers.

7. Local Library Apps: Some local libraries provide access to digital collections via apps like Libby or OverDrive. You can borrow eBooks or audiobooks by signing in with your library card.

8. Amazon Kindle Store: Amazon Kindle Store has a section dedicated to free Kindle eBooks.

While many of these books are from lesser-known or independent authors, you can still find interesting reads. Amazon also offers limited-time promotions where popular books are temporarily available for free.

Remember that while many books available through these platforms are in the public domain, others may be offered for free by the authors or publishers for a limited time. Always check the terms and conditions to ensure that you are accessing the books legally and respecting copyright laws.