StructureMap

StructureMap is a Dependency Injection / Inversion of Control tool for .Net that can be used to improve the architectural
qualities of an object oriented system by reducing the mechanical costs of good
design techniques. StructureMap can enable looser coupling between classes and
their dependencies, improve the testability of a class structure, and provide
generic flexibility mechanisms. Used judiciously, StructureMap can greatly
enhance the opportunities for code reuse by minimizing direct coupling between
classes and configuration mechanisms.

Ref:http://docs.structuremap.net/index.html