I would like to put a section on my site that contains subcategories of a directory for reciprocal links, at the moment its just one long list and without hand coding many html pages I was wondering if I could just add a php script.

Can anyone give me advice about adding a links directory to my site, I have seen this on many sites.

Are there free scripts out there? Do I need to subscribe to an exchange? Should I comission it out to a php expert?

Thanks in advance