I've compiled a list of helpful tools I use in my multi/dual monitor configurations. These are all freeware. You may download them from my computer. I excluded one that is commercial (Ultramon) because it's not free although it is outstanding as well.
Explanations are below:
Sizer – allows right-click on taskbar of any window to resize to configurable sizes.
WinSplit Revolution – you have to use this one to really understand it, but it's my favorite. It breaks the screen into quadrants and allows you to use CTRL+ALT and the number keys to arrange the windows on the screen. For example, to make a window use half of the screen, you use CTRL+ALT+6. If you want it to use ¼ of the screen you use CTRL+ALT+9.
DisplayFusion – a few little features in the free version, the pro version has additional features.
- Drag maximized windows between screens
- Middle click on a window to move it to another screen
- Wallpaper – allows you to run different wallpaper on different screens