NTNU has made arrangements so that all the students and emplyees has access to free/inexpensive software. At ITEAs site you'll find an overview over all the software NTNU offers their students.
Different arrangements:
The software is available from a server called Progdist.
More information on how to connect to Progdist can be found here:
When you're connected to Progdist, you'll see that there are three catalogs to choose from; Campus, Betal and Fri. Everybody has access to Campus and Fri. There are many different programs listed in the catalogues and in those program folders you'll find installation files sorted after different operating systems and a file called Lesmeg.txt that can help you with the installation of the software.
If you have a stationary computer without an Internet connection, you'll have to stop by one of Orakeltjenestens offices and borrow a CD with the software from Progdist.