DarthOne
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A fan-made remake of the Command and Conquer FPS/RTS game Renegade, Renegade X is a free-to play game, which can be downloaded here
Like the original, its set during the last days of the First Tiberium War (Tiberium Dawn)
It has both an active online community and single player. With the later in the form of matches against bots and the 'black dawn' add on.
It also has a wiki:
Renegade-X Wiki
As well as a video you can watch to get a idea of how the game is played:
And in exciting news, the devs have recently announced that they're making a version set during the Second Tiberium War (Tiberium Sun)!