PHP

Ad Management
Affiliate Programs
Auctions
Blog
Bookmark Management
Calculators
Calendars
Chat Scripts
Click Tracking
Communication Tools
Classified Ads
Content Management
Contests and Awards
Countdowns
Counters
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
Image Galleries
Image Manipulation
Interactive Stories
The link of the Website Checking
The link of the Website Indexing
Mailing List Managers
Match Making
Miscellaneous
Multi-Level Marketing
Multimedia
Music Libraries
Networking Tools
News Publishing
Organizers
Polls and Voting
Portal Systems
Redirection
Search Engines
Security Systems
Server Management
Site Navigation
Site Recommendation
User Authentication
User Management
Web Fetching
Web Hosting Tools
Open Directory Project
Postcards
Quote Display
Reviews and Ratings
Site Mapping
Software Repository
Tests and Quizzes
Top Sites
URL Submitters
Usenet Gateway
Vertical Markets
Virtual Communities
WAP and WML
Web Rings
Web Search
Web Traffic Analysis
Customer Support
Randomizing
XML and PHP