Anyone who have read anything by J.-H. Rosny aîné?
You know, the guy who wrote novels set into prehistoric times, like Quest for Fire which was adapted into a movie starring Everett McGill and Ron Perlman as Neanderthals (or something like that).
Some of his stories are now available in English, and three of them sounds interesting and makes you think of both Annihilation and Roadside Picnic (and to some degree The Lost Room (2006)):
In "The Cataclysm", the physical laws of nature change in an entire region of France because of the arrival of a strange electro-magnetic entity from outer space.
"The Mysterious Force" is about the destruction of a portion of the light spectrum by aliens who, for a brief while, share our physical existence.
In "Hareton Ironcastle", explorers discover a mysterious alien world, fauna and flora, embedded in the Heart of Africa. It has previously been translated by Philip José Farmer, but so much was changed from the original story that less a translation and more a retelling (according to the rumors).
I have not read any of these myself yet, but for those who enjoyed Annihilation, these could be interesting as well.