Atmel AVR C cross-compilers are powerful software tools designed to enhance the development process for Atmel AVR microcontrollers. These cross-compilers enable programmers to write code in the C programming language and then convert it into machine-readable instructions that can run on AVR microcontrollers. With the help of AVR C cross-compilers, developers can streamline their workflow, write efficient and reliable code, and unleash the full potential of Atmel AVR microcontrollers.