This chapter has surveyed the range of available add-on software for UNIX System computers. It should give you some idea about the range of available software. When you are ready to obtain software to meet a particular need, you should survey the commercial market and the archives of open-source software on the Internet, talk to other users, and contact vendors directly Before making your purchases or investing time in downloading and installing a software package over the Internet, make sure that the products will work on your hardware/software platform and that they perform the tasks you need done.