As a part of their Command & Conquer 4: Tiberian Twilight promotion, Electronic Arts (EA) released their classic
Command & Conquer: Tiberian Sun + Firestorm expansion for free! Yup, it’s free for download and play.
This is the third time EA released a classic game free for download. They’ve made Red Alert and Tiberian Dawn free and may still be downloaded with Tiberian Sun on their classic website. You might as well make a pre-order of Tiberian Twilight while downloading.