A list of Tolkien’s books you can read online for free.

camellia93:

-The Silmarillion

-The Hobbit

The Lord of the Rings
1) The Fellowship of the Ring
2) The Two Towers
3) The Return of the King

-The Children of Hurin

-Beren and Lúthien

-Unfinished Tales

History of Middle-earth
1-2. The Book of Lost Tales 1 and 2
3. The Lays of Beleriand
4. The Shaping of Middle-earth
5. The Lost Road and Other Writings
6. The Return of the Shadow (The History of The Lord of the Rings I)  
7. The Treason of Isengard (The History of The Lord of the Rings II)
8. The War of the Ring (The History of The Lord of the Rings III)
9. Sauron Defeated (The History of The Lord of the Rings IV)
10. Morgoth’s Ring
11. The War of the Jewels
12. The Peoples of Middle-earth


-The Letters of J.R.R. Tolkien

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Tolkien’s books irrelevant to Middle-earth:

• Tales from the Perilous Realm
• The Fall of King Arthur
• The Legend of Sigurd and Gudrún
• Essay on Fairy Stories

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Links to learn Tolkien’s languages:

Sindarin      Quenya       Khuzdul
   
-Ardalambion: One of the most comprehensive sites about all Tolkien’s invented languages

-Parf Edhellen: An excellent online Elvish dictionary