Electronic Arts have made Tiberian Sun and the Firestorm Expansion package become freeware. Click on the Image below to check it out!

Set in the early 21st century, Tiberian Sun once again pits the Global Defense Initiative against the Brotherhood of Nod in a struggle for control of the planet. With an epic storyline that unfolds as play progresses, players learn the reasons behind the worldwide outbreak of Tiberium and what happened to the notorious Nod leader Kane, who was presumed dead at the end of the first Command & Conquer.
http://www.commandandconquer.com/classic?sourceid=eag1321