I'd like to nominate Deathworld
by Harry Harrison. This is available for free all over the place including in our own MR library.
I've never read it but I've been told many times that it's a fantastic story.
Deathworld is the first in a series of novels begun in 1960 and originally serialized in Astounding Science Fiction Magazine. It’s the story of Jason dinAlt a professional gambler with psionic skills who finds himself on Pyrrus the deadliest planet to be colonized by humanity. Violent weather, active tectonics, heavy gravity, abundant predators, and a hostile splinter group of colonists is only the beginning of Jason’s quest to learn the truth about Pyrrus.