Can you please suggest good codes for Yellow Pages, Message board, classified ads, email manager on our website. We would like to use the codes if they are good and either free or reasonably priced instead of paying monthly

We would like to have yellow pages where people can pay and post their ad with different categories and by location.

We want to have forums where people can discuss stuff.

Can anyone suggest a good code or program that lets us have classified ads section on our website where people can post ads for free or pay for additional features.

We are also looking for an email manager that can handle any number of emails, with subscribe/ unsubscribe feature, auto responders etc.

I would really appreciate if you can suggest me some good stuff that is either free or reasonably priced. We don't want to pay monthly or yearly fee.
Thanks
Srujan

If you want free scripts, start at one of these:

PHP Resource Index
ASP Resource Index
HotScripts


Those three all list scripts by categories and have user ratings etc. You're bound to find several solutions on there.