Atom.io package which helps to extract information from photoshop layers.
It's very early version so it only collects css information, below is all supported css properties:
width
height
top ( in psd document )
bottom ( in psd document )
font-size
font-family
font-weight
color ( rgb/rgba )
line-height
background-color ( rgb/rgba )
background-image: linear-gradient ( not tested with complex gradients )
text-shadow
box-shadow
opacity
border
border-radius
text-transform ( uppercase only )