“Parallel and Concurrent Programming in Haskell” is available online on O’Reilly Media’s Open Feedback Publishing System.
Free Haskell Books
“Developing Web Applications with Haskell and Yesod”, written by Michael Snoyman and published by O’Reilly Media, is available online. Read it on authors’ website. This book introduces web application development with Haskell and Yesod.
Free eBook “The Haskell School of Music: From Signals to Symphonies”, written by Paul Hudak, is a textbook on functional programming in Haskell, with a strong focus on computer music concepts and applications.
This is the free online version of the book “Real World Haskell”, published by O’Reilly Media.
Free online book “Learn You a Haskell for Great Good!” by Miran Lipovaca is a hilarious, illustrated guide to this complex functional language. Packed with the author’s original artwork, pop culture references, and most importantly, useful example code, this book teaches functional fundamentals in a way you never thought possible.