Here is a list of publishers that specialize in cyberpunk and post-apocalyptic science fiction:
Angry Robot Books - publishes a wide range of science fiction and fantasy, with a focus on gritty, high-octane stories in the cyberpunk and post-apocalyptic genres.
Rebellion Publishing - publishes a wide range of science fiction and fantasy novels, including the popular "2000 AD" and "Judge Dredd" comics, which often feature cyberpunk and post-apocalyptic elements.
Night Shade Books - specializes in science fiction, fantasy, and horror, and has a reputation for publishing high-quality, boundary-pushing stories in the cyberpunk and post-apocalyptic genres.
Tachyon Publications - specializes in science fiction, fantasy, and horror, and has a reputation for publishing thought-provoking and literary stories in the cyberpunk and post-apocalyptic genres.
Aqueduct Press - specializes in feminist science fiction and fantasy, and often publishes stories in the cyberpunk and post-apocalyptic genres that explore themes of gender, race, and power.
Solaris Books - specializes in science fiction and fantasy, and often publishes stories in the cyberpunk and post-apocalyptic genres that are well-written and thought-provoking.
Crossed Genres Publications - a small press publisher that focuses on publishing fiction and non-fiction that crosses genres, with a focus on stories that explore social issues and diverse perspectives, including cyberpunk and post-apocalyptic stories.
Gollancz - an imprint of Orion Publishing Group which publishes science fiction, fantasy, and horror, and has a reputation for publishing high-quality and innovative stories in the cyberpunk and post-apocalyptic genres.
These publishers are a good starting point for anyone looking to find new and exciting stories in the cyberpunk and post-apocalyptic genres. Keep in mind that each publisher has their own submission guidelines and it is important to read and follow them before submitting a manuscript.