Plugins, like Perlin noise, in the Unity indie

I have the indie version of Unity, and according to the documentation, plugins (like perlin noise and Exocortex_FFT for example) can only be used in Unity Pro. I have downloaded the Perlin noise example, and they seem to be able to use the Plugins in Unity free, but there is no documentation showing how to achieve this. Is there any way to us C, C++, ect. plugins in the free version of Unity?

Any help would be greatly appreicated.

You answered your own question: “according to the documentation, plugins (like perlin noise and Exocortex_FFT for example) can only be used in Unity Pro”

from http://unity3d.com/support/documentation/Manual/Plugins.html

“Plugins are a Pro-only feature. For desktop builds, plugins will work in standalones only. They are disabled when building a Web Player for security reasons.”