qdPM is an open source project management application that is created for small teams in mind.
It is built with PHP/MySQL & relies on Symfony Framework (bundled with the download package).

It has support for adding extra fields for projects, tasks & users which eases customizing the application.
With the multiple task editing feature, it is possible to work with multiple tasks faster.
Projects in qdPM can be set to different billing types like per hour, fixed price, etc. & a powerful reports module helps analyzing these data like any other data in the system.
The application is multilangual & already comes with various language files.
Requirements: PHP 5.2.4+, MySQL 5+
slideViewerPro is a totally customizable jQuery image gallery plugin.
It is derived from the popular slideViewer plugin & offering more features.

The gallery is created from an unordered list with any number of images.
Some of the features are:
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display images automatically
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show captions on/off
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shuffle on/off
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custom prev-next buttons
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ability to define the animation & slide periods
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& more
The look & feel can be customized via CSS and from the settings of the plugin like the borders, colors, etc.
Requirements: jQuery
Compatibility: All Major Browsers
The Fluid Grid System is a CSS framework which combines the principals of the typographic & baseline grid into a resolution-independent one.
It has a comprehensive logic. The classes are mentioned like: six_column section or three column which makes it easier to use & understand.

With the simple layout & use of CSS, the Fluid Grid System degrades well in both older web browsers, scales with text nicely & presents content to screen readers in a logical manner as well.
The framework is also great for rapid prototyping besides final production layouts as designers can quickly design complex layouts.
Compatibility: All Major Browsers
conjoon is a web-based open source application, built with the Zend Framework, that focuses on message exchanging.
Currently, it is a full-featured webmail & RSS reader client with contacts management. But the upcoming releases show that it will also have an integrated Twitter client with multiple accounts support.

Thanks to Ext JS, the application has a slick desktop-like interface with tabs, drag'n drops & more.
It comes with a web-based installer & requires PHP/MySQL to run.
Requirements: PHP 5.2.5+, MySQL 5+
Compatibility: All Major Browsers (ecept IE6)
After The Deadline is a project of Automattic (the creator of Wordpress) which checks:
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spelling
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grammar
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styles (finds complex phrases, cliches, bias-language & suggests simple ones)
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and detects misused words (has a database of 1500 most misused words & suggestions)

The software used to come as a plugin for several projects (like Wordpress, RoundCube, PHP List) but it is now open source and anybody can embed it to their own code.
Besides the artificial intelligence it already has, it is possible to add new rules & improve the application.
The project also has libraries for jQuery, Ruby & Python to make developing new plugins easier.
Requirements: Sleep Scripting Language, Moconti Sleep Application Server
XMail Server Lite is an open source & free mail server with an Ajaxed webmail bundled to it.
It is compatible with Window & Linux OSs with 2 different installers provided.

The server is capable of managing SMTP/ESMTP & POP3 protocols with web-based administration panel.
It supports unlimited domains/users including virtual domains & aliases.
XMail Lite also offers anti-virus integration, bayesian filters (for spam protection) & a logging functionality of all the activities.
The Webmail Lite can display folders/nested folders, has an address book, multilingual & much more.
Tip: The webmail can be downloaded & installed as a standalone product too (from here).
Requirements: Windows or Linux OS
MODx is a powerful open source CMS that is built with PHP & uses MySQL for storing the data.
It focuses on offering zero restrictions while creating a website & has a flexible template engine + a robust API for creating anything customized.

The application has a crowded community which already created lots of plugins to extend its functionality.
It comes with TinyMCE integrated, which is a great HTML editor, but new ones can be installed with ease.
MODx is also a SEO-friendly CMS with the URLs & meta content it creates.
P.S. The application is not a fresh resource, it is around for more than last 2 years. However, it became more mature & stable with the release of the GA version 1.0. So, you may want to take a look at it again.
Requirements: PHP 4.3.11+ (mod_rewrite enabled) & MySQL 4.1.20+
Compatibility: All Major Browsers
Piwik is an open source website analytics application which provides detailed statistics about visitors, keywords, pages & more in real-time.
It can be installed on an any PHP-MySQL compatible webserver & the rest works similar to Google Analytics; inserting the tracking codes into the websites we want to track.

One installation of Piwik can track unlimited number of websites which is great for web design companies who would prefer to offer a branded/customized solution to their customers.
Also, the user interface is fully customizable: you can drag and drop the widgets you want to display and create a report especially tailored to you.
The application is built around plugins which means it is possible to add/remove features easily.
Its open API makes integrations with 3rd party software possible. And, here are 2 desktop applications that use this API to bring Piwik to your desktop:
Read the rest of this entry »
Requirements: PHP 5.13+, MySQL 4.1+
Compatibility: All Major Browsers
jQuery (mb)Gallery is a jQuery plugin for creating image galleries with a slideshow feature.
It is possible to present the galleries in any way wanted & adding a link to display them in the main gallery viewer.

The plugin has an inline thumbnail browser which is great to easily switch between images.
It offers multiple parameters for an easy customization like:
- width, height & colors
- auto-starting from a pre-defined image
- auto-sliding to be on/off
- timings between each slides
- & more..
Tip: The author of the plugin, Matteo Bicocchi, has other jQuery plugins which are presented in his ideas repository.
Requirements: jQuery
Compatibility: All Major Browsers
InDefero is an open source software forge application, built with PHP, that enables anyone to create a multi-project Google Code/Sourceforge-like system to manage their codes.
It eases tracking bugs, providing downloads, documentation and having an easy overview of the code base both for you & your team.

Also, it makes communicating with the user-base possible which is vital for a healthy development process.
InDefero has other powerful features like:
- every user has their personal dashboards
- code browser with git, Subversion & Mercurial support
- project timeline
- powerful search engine
- diff visualization of the commits
- inline display of text files from the repository with syntax highlighting
- & much more..
It requires a webserver supporting PHP as module or fast-cgi & PostgreSQL, SQLite or MySQL 4.1+ as the database to run.
Requirements: PostgreSQL, SQLite or MySQL 4.1 & PHP