This is the most advanced hair system, for professional use, that I am aware of:

Hair Farm

The creation is very easy, and styling tools advanced. You can also use a mesh hair as base for the strand creation, or the other way around. Aside from this, many packages have their own hair gen system, and some use different tech than others. Blender, for example, uses particles for realistic hair creation. Maya has a built-in paint FX system that can be used for hair. I'm not sure what Modo uses, or C4D. The true advancement really comes in the rendering of the hair, not the creation. Vray has a spectacular, realistic volume hair shader, and other render engines have their own native hair shaders that can be more or less realistic.

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