It is somewhat green-ish, but I do not think that it is A/C as some have said. The camera is right below the A/C compressor on this picture, and no a/c lines besides possibly where it goes into the cabin would be leaking where it appears to be. If the a/c system was that far open, OP would have no a/c. It's not PS fluid because this vehicle as electronic power steering. The thermostat is on the back of the engine (which could be leaking), but this vehicle has either blue to pink coolant, therefore rules those out. Leak is too far away from the transmission (is to the right of the picture, off-screen). Even if the transmission fluid is green, there's no reason it would be in that area of the engine.
I think the "leak" is from previous oil changes, and no leak is actually present. Rather this is oil that dripped from when the canister filter when it is removed out of the rear of the engine (it is situated between the rear of the block and the firewall).
For anyone confused by the angle of this picture, the tire to the left is the right front tire.