How can I smooth a mesh as in modelling software in Unity?

I am editing a mesh on mouse tap over the mesh, how can I achieve maya type smoothness?

This may also be of help; There is new asset on the Unity Asset Store called Polybrush.

Polybrush on the Assetstore

Brackeys does a good job explaining it in this video:

Brackeys Video

There is no such feature in Unity to smooth meshes but it can be achieved programatically. Take a look at MeshSmother on Unity Wiki.

Actually the answer to this is incorrect in saying there is no such feature in Unity as there are means of achieving this with Unity.

Here is an earlier question asked which has answers covering a few ways to achieve this, in modelling applications and/or in Unity - hopefully this helps other people finding this: