CodeIgniter

CodeIgniter is a powerful PHP framework with a very small footprint, built for PHP coders who need a simple and elegant toolkit to create full-featured web applications. Its goal is to enable you to develop projects much faster than you could if you were writing code from scratch, by providing a rich set of libraries for commonly needed tasks, as well as a simple interface and logical structure to access these libraries. CodeIgniter lets you creatively focus on your project by minimizing the amount of code needed for a given task.

FEATURES

Model-View-Controller Based System
Extremely Light Weight
Full Featured Database Classes With Support For Several Platforms.
Active Record Database Support
Form And Data Validation
Security And Xss Filtering
Error Logging
Application Profiling
Calendaring Class
User Agent Class
Session Management
Trackback Class
Xml-Rpc Library
Search-Engine Friendly Urls
Flexible Uri Routing
Localization
Data Encryption
Full Page Caching
Email Sending, Supports Attachments, Html/Text Email, Multiple Protocols.
Image Manipulation Library. Supports Gd, Imagemagick, And Netpbm
Zip Encoding Class
Template Engine Class
File Uploading