DisplayFusion - DisplayFusion will make your multi-monitor life much easier.
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.
Dual Monitor Taskbar - Download Dual Monitor Taskbar for free. A taskbar for the second monitor.
nView - Effectively manage your desktop with NVIDIA nView.
Actual Window Manager - Actual Window Manager 8. 11. 3..
EasyRes - EasyRes is a fast screen resolution switcher for Mac OS X with live animated previews.