Have you been tempted to give NGUI a try, but just don't want to commit to spending money on something that you may not use? Good news! You can now get all of NGUI's features for development, evaluational, educational and/or internal use with the Free Edition.
Click the logo to download the Unity Package.
What's in the package? Everything NGUI comes with -- this includes all of the functionality up to and including version 2.0.7c -- Atlas Maker, Font Maker, all of it.
What's the catch? Aside from the non-commercial usage restrictions, NGUI's "Free Edition" message will be shown when you launch your application, and NGUI's watermark will appear in the top-left corner. Example 3 is also missing (orc inventory), because it's a bonus example.
But the rest is there.
And now the really interesting bonus:
If you are a developer, you are welcome to create your tool or Asset Store-bound package using the standard or free version of NGUI, then swap it out with the Distribution Version package before submitting it to the Asset Store. All I ask is that you clearly state that your product is using NGUI and that the contents of the NGUI folder is the work of Tasharen Entertainment. You should also not modify the contents of the NGUI folder, aside from removing whatever items you don't need.
This lets you freely use NGUI for your Asset Store-bound work where before you were limited to Unity's GUI.