Questions About Project on Software

Do I have to download three different math software in order to do this project? I don't like the idea of crowding my harddrive with extra software. Are there any computer on campus (like here in Buck or at the library) that already have a bunch of different math software downloaded on them? Having too many different software on my laptop will make my laptop run slower, which I am not looking forward to. Or is there a way I can review these software without actually downloading them?