Native Toolkit is a lightweight plugin that makes it easy to integrate native mobile functions into your iOS, Android or Windows Phone 8 project. Native Toolkit works with Unity 4.x and 5.x
With just one line of code you can:
Pick image from gallery / camera roll
Open camera and take a photo
Save screenshot to gallery / camera roll
Get device GPS location
Send email with attachments
Schedule local notifications
Pick contact from address book
Rate App on App Store / Google Play
And more. Please refer to the scripting reference for the full list.
Full C# Scripting Reference here
Native Toolkit also comes with a Facebook wrapper that will streamline the integration of Facebook SDK functions into your App. With one line of code you can:
Login to Facebook
Get user details
Get user profile pic
Share status to wall
Share image to wall
Share to friends