AS is a portable macro cross assembler for a variety of microprocessors and -controllers. Though it is mainly targeted at embedded processors and single-board computers, you also find CPU families in the target list that are used in workstations and PCs.
AS is distributed under the GNU General Public License. You may use it for any commercial or non-commercial purpose without having to pay for it. If your really like AS, I encourage you to donate to an organization like Greenpeace, Doctors Without Borders, or the World Wildlife Fund. If you want to integrate AS or parts of it into other projects, regard the rules set up by the GPL.
You may already have noticed that I did not pay much attention to the outer appearance of these pages; The reasons are manifold: