Dualless for Chrome is a nifty little extension that gives you a dual monitor display without spending money on two monitors.

Monitors are an expense that some can't or won't take on due to price or even just a lack of space - Dualless solves the problem for the scenarios. It provides you with a split screen in varying sizes and orientations.

Dualless effectively splits your browser windows into two via 2 clicks. You can adjust the ratio depending on your needs. Like a right/left? You can set it so your browser window shows on the right will occupy 30% of your screen. Then the rest of the space can be left leave to other activities like watching how-to videos from MajorGeeks, for instance.

It simulates the environment of a dual monitor setup utilizing the space for a 16:9 monitor. Dualless is a simple and easy to set up option for dual monitors when space or budget are at a premium.

Dualless Features:

Split the current browser window into a pair. And resize their position according to the preferred ratio. (3:7,4:6,5:5,6:4,7:3)
Merge the split browser windows back to a single window, or make it occupy the full-screen area
MacOS X like windows management. When one of the split windows is focused, the other pairs will be shown together (they always occupy the whole screen)
Press the middle key on the split window button and it will duplicate the current page on the other window
Bookmark management. Relaunch your favorite site in a new tab and windows will be split with the recorded ratio

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