UnityVS now free: Use Visual Studio instead of MonoDevelop to design games

UnityVS is now a product of Microsoft, as Microsoft Acquired SyntaxTree. This means that you can use Visual Studio to develop Unity Apps, Games, for free.

Visual Studio 2010 Tools for Unity
Visual Studio 2012 Tools for Unity
Visual Studio 2013 Tools for Unity

Some cool features include:

Project Explorer right inside VS, no need to jump over to Unity while coding