I usually play at the library, and I'm not able to download any programs to the libraries system. Is there a way or site that I can run gmud or zmud without having to download?

Gmud is small enough to stick on a disk. Just stick it on one and carry it with you. When you want to use it, throw it onto the desktop, use it, and when your done, clean up. You should even be able to run it directly from the disk, but ive never tried.