[jstarfish]

You can see some of the lighting halo/starbursts from where longer exposures were used, but much of the magic here is HDR.

[cthalupa]

I don't think it's even HDR. Just desaturated most of the colors, and hard pumped blue and purple.

To the GP: Search for cyberpunk / neon noir filters on google and tutorials on youtube. You'll find dozens to hundreds for both.