Blacklight: Retribution is a futuristic first-person shooter, a sequel to Blacklight: Tango Down. It is based on the free-to-play business model. It is being developed by Zombie Inc. and published by Perfect World. The focus is on a customizable weapon system that doles out upgrades one at a time as players level up.
Solid F2P, Very well balanced and a great mix of old school pacing and new school gunplay. There is a shitload of customization available, ranging from the very parts your guns are made of, to your armor, and your player logo. The only real drawback to this is that items can be very pricy, with new body armor costing 7-10$, but this can be overlooked since you constantly get free trial items when you rank up.