The Unreal Engine has the ability to align and distribute nodes:
Does Blender's node editor have such a feature hidden somewhere?
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5$\begingroup$ You can scale and rotate multiple nodes like you would object origins, but it's a little limited. There are some addons which provide this kind of functionality though (e.g. Node Wrangler, which is bundled with blender) $\endgroup$ – gandalf3♦ Nov 11 '15 at 23:05
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Default transforms:
You can rotate and scale multiple nodes as you can objects with Manipulate origins enabled:
You can use the usual tricks, e.g. press S X (or Y) 0 to align nodes along a particular axis. Note that the "origins" of all nodes are at the top left.
Node wrangler
This addon comes bundled with blender by default, but you'll have to enable it. It comes packed with all kinds of workflow accelerating functions and shortcuts; press ⎈ CtrlSpace in the node editor to get a menu of all of them.
One such function (⇧ Shift=) aligns the selected nodes:
NodeArrange
An experimental script recently featured which completely rearranges an entire node tree:
