Purpose of the project

[thelusiv]

If "open data" is not in the same sentence, "open source" tends to be less confusing than "Free software" — it just sounds stupid to have open so many times in the same sentence.
I'd suggest avoiding directives ("must be") also. It actually makes the statement sound weaker. Should be in the process of acheiving goals, not determining what they are.

Maybe it should be "developers and artists"?

I agree with all of the above.

VDrift aims to be a high-quality, open source racing simulation featuring enjoyable and challenging gameplay. The project strives to take advantage of modern computing hardware to accurately simulate vehicle physics in rich and immersive racing environments. To meet these goals, a cooperative community of developers and artists uses VDrift as a platform for creative experimentation.

The last sentence was awkward. The meaning has changed slightly, but hopefully it expresses the same idea. I like the change to "maintains", but "{subject} maintains {noun} to {noun}" doesn't make sense. It makes more sense to use "maintains ... for" but then the word for is repeated, which makes it ambiguous whether VDrift is maintaining the platform for experimentation or for a community. So by making the community the subject of the sentence, it is clearer what is going on, and shorter to boot. I moved creative to avoid using the word "open" again.