Male Mesh Head Creators in Second Life:
There are two kinds of mesh heads in second life, Bento and Non-Bento. With Bento heads you are able to somewhat alter the appearance in certain areas of the face using sliders in the edit appearance menu for your avi. With Non-Bento mesh heads, the shape is non-alterable and you rely mainly on skins to specify your appearance.
Akeruka Creations (AK)
The Mesh Project (TMP)