Links: Unity Tools

Level building is pretty fiddly but here are links that might make it easier:

Positioning Objects via the Unity Manual. Check out the notes on Unit and Vertex snapping.

Align Positions via the Unity Manual. An example script from Unity.

Snap to Grid by Hayden Peake: Can be useful if you're working on a grid layout and to a particular scale.

LineMup by Matthew J. Collins. Aligns and distributes even spacing between selected objects. Comes with an instructional video.

Transform Utilites by Daniel Rodríguez (Also found here): A pretty hand tool for aligning objects in a scene, it's a little more technical than the other options but makes things much easier.

Now back to scalding my eyeballs with Wow-Wow Sauce and other ritualistic activities that make up level building. A proper post is coming