DisplayFusion - DisplayFusion will make your multi-monitor life much easier.
SmartWindows.app - Auto arrange all your app windows, whether on one screen or many with a single click!
Ultramon - UltraMon is a piece of software built to help with the management of multiple screens on the same computer system. Without software like this, taking full advantage of an expanded desktop space can be difficult.
ReIcon - ReIcon is portable freeware that enables you to save and restore your desktop layout.
Actual Multiple Monitors - Actual Multiple Monitors is a software utility which offers the comprehensive solution to improve the functionality of Windows user interface for comfortable and effective work with multi-monitor configurations.
VC Starter Kit - Everything you need to look like a Venture Capitalist