SplitScreen is a Sublime Text 2 plugin which allows you to define custom ratios for split screen editing.

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By default, Sublime has some predefined split-window configuration, accessible via the Alt+Shift+<number> hotkeys, however, if you want something other than these presets, it is quite difficult to create your own. Enter SplitScreen!

1. To activate, press the hotkey, Alt+Shift+S, and an input box will appear at the bottom of the screen.

2. Enter some ratios, horizontal (columns) first, and then vertical (rows) second. Numbers are treated as a ratio, so 50:50 is identical to 1:1. Separate columns and rows with a comma. If you want only one row or column, then that can be left blank.

For example:

50:50
(2 columns, equal width. 1 row)

--------------------
|        |         |
|        |         |
|        |         |
|        |         |
|        |         |
|        |         |
--------------------

1:2
(2 columns, one twice the width of the other. 1 row)

--------------------
|      |           |
|      |           |
|      |           |
|      |           |
|      |           |
--------------------

,1:1
(1 column, two rows equal width)

--------------------
|                  |
|                  |
--------------------
|                  |
|                  |
--------------------

70:30,2:1
(2 columns, 2 rows)

--------------------
|             |    |
|             |    |
|             |    |
|             |    |
--------------------
|             |    |
|             |    |
--------------------

Tip: To go back to just one window, you can enter an empty string, or a single number, or simply use the built-in hotkey Alt+Shift+1.