Who made system software?

System software was developed by various computer scientists and engineers over the decades, with key contributions from pioneers like John von Neumann, who helped design early computing architectures, and others like Grace Hopper, who developed the first compiler. The evolution of operating systems, such as Unix by Ken Thompson and Dennis Ritchie, and Microsoft Windows by Bill Gates and his team, also played significant roles in the development of system software. Overall, it is a collaborative effort across multiple organizations and individuals throughout computing history.