Zoop is an object oriented framework based on a front controller. It is designed to be very fast and efficient and very nice for the programmer to work with. It is easily extensible, and you need only include the functionality you use. It features GuiControls (a PHP implementation of .net's webcontrols), AJAX support and integration, automatic form validation and creation (including db integration), a Smarty templating system, PDF creation, session handling, and SMTP template-based email sending.
XPertMailer is a PHP class that you can use to send encoded MIME type e-mail messages (text, HTML, HTML embedded images, attachments) towards a client or relay SMTP server with optional authorisation and TLS/SSL support. Cc and Bcc functionality is included. The class functions are optimised to execute in a very small time and to be easy to use. The data sending is done according to RFCs 821, 822, 2821, 2822, and 2487, and the message type conforms with RFCs 2045, 2046, 2047, 2048, and 2049.
php Free Chat is a simple, fast, and customizable chat server that uses the filesystem for message and nickname storage. It uses AJAX to smoothly refresh and display the chat zone and the nickname zone. It supports customized CSS stylesheets and a plugin system that allows you to write your own storage routines.
cache4j is a cache for Java objects with a simple API and fast implementation. It features in-memory caching, a design for a multi-threaded environment, both synchronized and blocking implementations, a choice of eviction algorithms (LFU, LRU, FIFO), and the choice of either hard or soft references for object storage.