I have been woorking as the computer system administrator of Department of Mechanical Engineering, FAU since September 1997. I have more than 200 users. COM gives you online access to an expanding library of Sun technical documentation on both hardware and software products. Not only for UNIX system adminstrator, but gives a lot of help to you. These packages contain full versions of useful programs such as compilers and programming tools.
Documentation is provided on how to install.
Very useful for admins with little time to recompile software. Solaris Freeware SunSITE Home Page Provide free software and tools. It has a lot of mirror sites and not only for the products by Sun Microsystems. This is what they say in the cover page. You can find out what GNU is for a UNIX systema diministrator.