Module for Custom Content on Product Page

I am looking out for a Extension for Custom Content on Product Page.

I am using Oxy theme with 3 column product page. In the 3rd. column I want to display contents related to the respective product. The most important point is that the custom content for each product will be different depending on the product.

There is built in options of Custom Block in Oxy theme, but same content is displayed for all products. However I don't want same content. I want different content to be displayed for all products. Is there any extension to achieve this?

Thanks in advance.

- Harish