SlimStat is an open source web analytics application that collects & presents statistics information about your website.
It is built with PHP-MySQL & can be integrated into websites with JavaScript (like Google Analytics) or PHP.

For  the given period, the application can display:

the number of visitors/pageviews
referrer URLs, domains
search terms
browsers, OSs, countries, screen sizes

OTRS is an open source trouble ticket system for easily managing support requests in a multi-agent interface.
The application can auto-convert e-mails into tickets (e-mail piping) which “eliminates the need of using the web interface” for customers.

OTRS is used by large organizations like Opera, MySQL AB, BitDefender, Suse & has very nice features like:

transfer of tickets [...]

Project Management is often defined as the science of organizing, planning and managing the available resources of a particular organization to successfully complete a project, which aims to meet the organization’s goals and objectives. This type of system will be useful in ensuring the timely and effective output of a project. Furthermore, the implementation of [...]

Symphony is a XSLT-powered open source CMS that is created with PHP & uses MySQL for storing data.
It offers a very flexible usage as the data, logic & templating layers are all independent, meaning that whatever you implement can be modified, added or removed with minimum effort.

When compared to other popular CMS applications, the biggest [...]

rsslounge is an open source, full-featured & web-based RSS feed reader application that is built with PHP-MySQL.
It allows you to read your feeds, categorize or filter them, set priorities & more from an Ajax-based slick interface.

Besides the standard feed items, rsslounge supports images & photoblogs.
For periodically fetching content from feeds, it offers 2 options: cron [...]

OpenProj is an Open Source Free Project Managemetn Software by Serena Software. This Free Project Management Software is a desktop replacement of Microsoft Project. OpenProj has equivalent functionality, a familiar user interface and even opens existing MSProject files.

OpenProj shares the most advanced scheduling engine in the industry with Projects On Demand. The OpenProj solution has [...]