This package provides you with everything you need to start efficient game programming. It adds several classes that are missing in Unity and the .NET framework, like a serializable dictionary with a custom inspector.
Unity Assetstore - Online documentation

The Unified Input Manager (codename: CarbonInput) is now available on the Unity3D AssetStore It serves as a replacement for the default Input Manager, giving you more control and better controller handling.
Unity Assetstore - Documentation