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.

Retrospectiva is an open source project management & bug-tracking application that is focused on development teams.

It is built with Ruby on Rails & requires a MySQL database for storing the data.

It has 3 main modules:

• ticketing: to manage issues/requests
• code review / revision management: supports Subversion & Git)
• milestones / goals: to set & manage objectives for the project

And, comes with various add-ons like:

• wiki: manage documentation
• blog: to interact with the community, make announcements.
• agilePM: comprehensive support for your agile development process
• & more, which can be found in the wiki's installation pages.

Retrospectiva has an easy-to-use admin interface, a XML-REST-based API for integration with 3rd party applications & RSS support for following every content much simpler.

Every web application that works member-based needs a functionality where visitors can register & manage their profiles.

UserCake is a free user management system, built with PHP/MySQL, which aims to be a foundation to ease creating the application.

UserCake is object-oriented, cleanly written, well commented, formatted & documented.

It offers the following functions:

• Login
• Register
• Lost password
• Update password
• Update user details
• Email templates (optional)
• Account activation (optional)
• User groups (Basic, id – group_name)

The system comes with frequently used member-page functions like isUserLoggedIn() or isGroupMember($id) which will help developing faster.

And, in means of security, UserCake uses salt along with a SHA1 hash.

Microblogging, with the wide usage of Twitter, is a hot subject in today’s web.

Using few words & spending less effort compared to the standard blogging, it becomes possible to share knowledge, feelings, etc. And, it keeps users connected to other users with the simple yet powerful community features.

While there are very popular microblogging services like Twitter, Tumblr or Plurk, being a rival may not be (or may be) the best idea. However, in order to create something unique, a community for a closed group or a microblog for a single user, there are still huge opportunities.

Here are 9 open source microblogging applications to create your own:

StatusNet (PHP)

StatusNet (previously Laconica) is the engine which runs the popular microblogging site Identi.ca.

It is built with PHP/MySQL & offers a smooth usage as it is a widely used, mature application.

P.S. The source can be found here.

Yonkly (Asp.Net)

Yonkly is an Asp.Net-powered Twitter-clone for creating your own microblogging community network.

Besides the open source version, it has a hosted & an advanced standalone version.

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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.

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:

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Tutorialzine is sharing a beautiful tutorial (with source) on creating an Ajaxed drag’n drop shopping cart with jQuery & PHP.

It uses MySQL for storing the data & simpleTip plugin for displaying information about the products with style.

It takes advantage of the jQuery UI’s draggable & droppable behaviours to accomplish the flawless experience.

The shopping cart is not a ready-to-go one for an e-commerce website but it is a nice base for creating one by improving the features.

Tip: Tutorialzine provides other nice tutorials which you may be interested in like:

• A Stylish Navigation Menu With jQuery
• Creating a Facebook-like Registration Form with jQuery

BambooInvoice is an open source & free online invoicing application, built with PHP/MySQL, which is ideal for small companies or freelancers.

It has an Ajaxed interface (totally unobtrusive) with structured & meaningful XHTML.

BambooInvoice enables anyone to:

• Add/edit/delete clients & related contacts
• Create invoices for clients, send them via e-mail, generate PDFs or print them
• Define the payments made to the system to follow them

Also, a reports feature displays a financial snapshot of the given period.

It can be customized easily by modifying the look & feel of the application.

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.

Mysql Ajax Table Editor is an open source web application for easily editing MySQL tables & creating admin pages almost instantly.

Besides the standard "add, edit, copy, delete, view" functionality, records can be paged, searched & exported to CSV.

It is possible to JOIN multiple tables to generate a custom view (+ apply any other functions on this view) with the help of a configuration file. Also, column names displayed can be customized for a better presentation.

MySQL Ajax Table Editor has permissions support which can be set on a per column or table basis for limiting functions.

Users can hide/show & re-order columns which is very useful when working with the data.

The application works with both PHP4 & PHP5 and comes with 5 ready-to-use languages where new ones can be created.