Helion

Helion SA is a Polish publisher founded in 1991. It has published over 1,800 IT books, but also publishes business books under the Onepress imprint and psychology books as Sensus. Further brands include Septem, Editio and Dla bystrzaków (For dummies)

From the Wikipedia article “Helion (publisher)”, licensed under CC BY-SA 4.0.

Large trade publishers generally accept manuscripts only through literary agents, while many independent and small presses accept direct submissions during reading periods. Before submitting anywhere, read the publisher's current guidelines, study recent books on its list, and never pay a reading or publishing fee to a traditional publisher.