Help finding a web catalog search tool

Xen Community:
I am looking to build an online search tool that allows Xen customers/prospects to search for solutions using/based on Xen. The search tool would take the prospects to a web page with content maintained by the solution provider – open source or proprietary. I believe adding this feature to Xen.org would be a great tool for all the businesses based on Xen.
So, anyone know of anything available that I can use? I spoke with a company last year in Minnesota  that offers something usable for about $20,000 so I am hoping to find something a bit more affordable. Any advice would be greatly appreciated.