* Ad Management 
* Affiliate Programs 
* Blog 
* Bookmark Management 
* Calculators... 
* Calendars 
* Chat Scripts 
* Classified Ads 
* Click Tracking 
* Communication Tools 
* Content Management 
* Contests and Awards 
* Countdowns 
* Counters 
* Customer Support 
* Database Tools 
* Date and Time 
* Development Tools 
* Discussion Boards 
* Documents 
* E-Commerce 
* Education 
* Email Systems 
* Error Handling 
* Exchanges 
* FAQ and Knowledgebase 
* File Manipulation 
* Financial Tools 
* Flash and PHP 
* Form Processors 
* Games and Entertainment 
* Graphs and Charts 
* Groupware Tools 
* Guestbooks 
* Healthcare 
* Image Galleries 
* Image Handling 
* Interactive Stories 
* Link Checking 
* Link Indexing 
* Mailing List Managers 
* Multimedia 
* Music Libraries 
* Networking Tools 
* News Publishing 
* Organizers 
* Polls and Voting 
* Portal Systems 
* Postcards 
* Quote Display 
* Randomizing 
* Redirection 
* Reviews and Ratings 
* Search Engines 
* Security Systems 
* Server Management 
* Site Mapping 
* Site Navigation 
* Site Recommendation 
* Software Repository 
* Tests and Quiz 
* Top Sites 
* Unsorted 
* URL Submitters 
* Usenet Gateway 
* User Authentication 
* User Management 
* Vertical Markets 
* WAP and WML 
* Web Fetching 
* Web Hosting Tools 
* Web Rings 
* Web Search 
* Web Traffic Analysis 
* XML and PHP