RT (Request Tracker) is an open source support ticket software that helps managing user-submitted tasks, issues easily.

Users can submit tickets via e-mail (e-mail piping) or from a web-based interface.

Tickets can have priorities & admins can assign them to each other if needed. And, it tracks critical information like time spent per action, due dates, and estimated time to completion.

From one installation, RT can track multiple projects for multiple teams. The application is written with Perl & works with MySQL, PostgreSQL or Oracle.

For a full list of features, click here.

Tracks is a web based, advanced & open source to-do-list (getting things done) application built with Ruby on Rails.

It comes with a built-in web server (WEbrick) which makes it easier to run on your own computer or it can be installed to any Ruby on Rails enabled web server.

Application has a very slick interface & offers a high usability with drag’n drops & Ajaxed actions.

Tracks is a multi-user to-do-list application where everyone can have their own tasks.

Items can be categorized, proritized, scheduled & starred (for reaching them easier).

With a chart-supported statistics page, you can see the progress of your tasks, analyze them better like finding out which are your productive days, which task took more then expected & more.

The application has a powerful feed support (text, iCal and RSS). You can subscribe to a list & get status updates for them.

Tracks also makes it possible to getting integrated with other apps. with its API. And, it provides a lightweight interface for mobile phones at  http://tarcksurl/mobile/.

VFront is a dynamic front-end for MySQL & PostgreSQL databases written in PHP and Javascript.

It is not a database administration tool like phpMyAdmin and not replacing it: interface is for basic user working on data. Think about VFront as an interface tool for database, similar to MS access, but taking the lead with an easy access via web.

Using VFront, masks for managing your data in AJAX style, different rules and privileges for groups can be created.

It has reporting features in XML,HTML,PDF, statistics and much more.

To run this application, the database must be MySQL 5+ or PostgreSQL 7.4+.

Sphinx is a standalone search engine application that can be integrated with your data sources to provide fast, size-efficient and relevant fulltext search functions.

To clear how powerful it is, Sphinx is already used in BlogCatalog, Joomla & phpBB community forums and more.

Sphinx currently supports:

• MySQL
• PostgreSQL
• XML Pipe mechanism that allows indexing of XML data

Some features of Sphinx:

• high indexing speed (up to 10 MB/sec on modern CPUs)
• high search speed (avg query is under 0.1 sec on 2-4 GB text collections)
• high scalability (up to 100 GB of text, upto 100 M documents on a single CPU)
• supports distributed searching (since v.0.9.6)
• supports phrase proximity ranking, providing good relevance
• supports any number of document fields (weights can be changed on the fly)
• supports different search modes ("match all", "match phrase" and "match any" as of v.0.9.5)