Transparent Shader Family 
Note.  Unity 5 introduced the Standard Shader  which replaces these shaders.
The Transparent shaders are used for fully- or semi-transparent objects. Using the alpha channel of the Base  texture, you can determine areas of the object which can be more or less transparent than others. This can create a great effect for glass, HUD interfaces, or sci-fi effects.
shader-TransVertexLit 
 
Assets needed: 
One Base  texture with alpha channel for Transparency Map 
 
» More details 
shader-TransDiffuse 
 
Assets needed: 
One Base  texture with alpha channel for Transparency Map 
 
» More details 
shader-TransSpecular 
 
Assets needed: 
One Base  texture with alpha channel for combined Transparency Map/Specular Map 
 
Note: 
One limitation of this shader is that the Base  texture’s alpha channel doubles as a Specular Map for the Specular shaders in this family.
» More details 
shader-TransBumpedDiffuse 
 
Assets needed: 
One Base  texture with alpha channel for Transparency Map 
One Normal map  normal map, no alpha channel required 
 
» More details 
shader-TransBumpedSpecular 
 
Assets needed: 
One Base  texture with alpha channel for combined Transparency Map/Specular Map 
One Normal map  normal map, no alpha channel required 
 
Note: 
One limitation of this shader is that the Base  texture’s alpha channel doubles as a Specular Map for the Specular shaders in this family.
» More details 
shader-TransParallaxDiffuse 
 
Assets needed: 
One Base  texture with alpha channel for Transparency Map 
One Normal map  normal map with alpha channel for Parallax Depth 
 
» More details 
shader-TransParallaxSpecular 
 
Assets needed: 
One Base  texture with alpha channel for combined Transparency Map/Specular Map 
One Normal map  normal map with alpha channel for Parallax Depth 
 
Note: 
One limitation of this shader is that the Base  texture’s alpha channel doubles as a Specular Map for the Specular shaders in this family.
» More details