Solr is an open source enterprise search server based on the Lucene Java search library, with XML/HTTP and JSON APIs, hit highlighting, faceted search, caching, replication, and a web administration interface.

(tags: ajax search lucene java solr apache opensource web api json http tomcat search-engine)

Trex is a high-level PHP 5 Web application framework that uses the best open source components rather than building everything again.

(tags: framework php web development webdev php5)

PHPXref is a developer tool that’s designed to ease the process of working on large PHP projects by making it very fast and easy to browse the code documentation along with the code itself.

(tags: api browser code document php documentation tools development software tool cross-reference source)

PHing Is Not GNU make; it’s a project build system based on Apache Ant.

(tags: ant automated automation build continuous-integration deployment php development tools phing make java)

Creole is a database abstraction layer for PHP5. It abstracts PHP’s native db-specific API to create more portable code while also providing developers with a clean fully object-oriented interface based loosely on the API for Java’s JDBC.

(tags: database framework lib library php abstraction php5 development orm)

The Zend_Filter component provides a set of commonly needed data filters. It also provides a simple filter chaining mechanism by which multiple filters may be applied to a single datum in a user-defined order.

(tags: data security php filter zend xss http)

Validator is a full-featured class for implementing FORM data validation. Based on PEAR QuickForm functionality and Cake’s basic validation features, Validator provides an easy approach to validating FORM submissions.

(tags: cake form forms html pear cakephp php validation validator library)

Small Java classes (Workers) can be written to implement various testing cycles. The tool runs many such workers simultaneously, showing their status (working, waiting, error) in real-time on a colored grid.

(tags: http java performance testing tests tool library)

Presentations from ApacheCon EU 2007

(tags: 2007 apache conference presentation solr lucene tomcat xslt apachecon)

Red5 is an Open Source Flash Server written in Java

(tags: audio content flash opensource server streaming video java flashcommunicationserver media)

For companies that need an enterprise chat server

(tags: application chat collaboration enterprise opensource im voip xmpp apache java mina server jabber)

For companies looking for a productivity-focused Instant Messaging Client

(tags: chat client im jabber opensource spark voip software java)

Qpid provides multiple language implementations of the AMQP specification and related technologies including transaction management, queuing, distribution, security, management and heterogeneous multi-platform support for messaging.

(tags: amqp apache java messaging opensource emb platform library jms python dotnet ruby)

(tags: apache performance optimization scaling best-practices papers whitepaper bestof)

Humanized Messages is a javascript-based system for non-model notifications, from an idea by Jef Raskin, as relayed by Aza Raskin and adapted for jQuery and use with K2 by Michael Heilemann.

(tags: ajax dhtml effects javascript jquery ui library usability message notify)