Even movies without visual effects will need software processing because more and more movies are shot digitally and the video files need post-processing. Companies like Pixar and Industrial Light and Magic develop custom software continuously in order to push the state-of-the-art in movie effects.
Apart from making movies, a production house is responsible for distribution and marketing as well. There are ERP systems that create orders with theaters and home entertainment networks to distribute movies. Data warehouse systems determine which is the target market and reach that is required to make movies from different genres profitable. All this is run by software. Although this may not be creatively linked with movie making but is a very crucial and essential part of the movie industry today.
Film is shot digitally, processed digitally and distributed digitally. It does not matter which program is used, code is king. Code runs it all today from the camera to the theater.