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.

Pandora FMS is an open source application that can be used to monitor anything online like:

• if a website is up or down
• if the content of a website is changed (deface control or when value of a stock changes..)
• diskspace or CPU usage of a remote server (via SNMP or TCP/IP)
• & many more..

Pandora FMS can run on any operating system, with specific agents for each platform, getting the data and sending it to a server.

You can get real-time reports for every monitor & have them sent to an e-mail adrdess.

It can also send notifications of events via e-mail, SMS or Jabber (MSN, GTalk..) to the desired users.

P.S. To mention, Pandora FMS is not a simple script to install. It is made up by several shellscript files (UNIX/Linux Agents), a Web application in PHP (Console), some code in C++ (Windows Agent), some code in PERL5 (Server) and some structure and data in SQL (Database).

Xuheki is an open source IMAP client with an Ajaxed interface.

It looks-feels like a desktop application & supports multiple IMAP servers/identities.

It uses the Net::IMAP::Client Perl module as the IMAP engine & built with DynarchLIB Ajax Toolkit.

Some features of Xuheki:

• Supports multiple folders with drag’n drop
• It can stay connected to an IMAP server
• Interface allows you to do multiple things once
• Multiple user support
• Contact list & more..

It requires Perl & MySQL 5 to run.

Mindquarry is a brilliant open source application to organize teams in means of documents, ideas and tasks. Shortly, their collaboration.

This team collaboration application can be reached both from the browsers and from a desktop application.

Document Management

The strongest part of the application is document management.  It uses Subversion for document versioning and backup, supports file syncronization, collaborative editing and has notification system for the updates made within the documents.

Wiki

You can create wikis, assigns them to teams or tasks to manage the ideas and information. Updates made to the wiki content can be viewed within the activity timeline, pdf output can be generated and more.

Team Management

Teams are holding the user groups together. They can be assigned to tasks, have their own wikis and permission groups on documents, tasks..

Task Management

Mindquarry has a handy task management module where tasks can be created, assigned to users, priority levels and their status can be set.

To mention, this is not a project management module and does not have milestones, resources, costs or chart features. It simply allows users to assign and control tasks (for a chance to win a great project management software license check the OneProject Project 8 giveaway).

Conclusion

If you are working in teams, need to share and work on documents together I believe Mindquarry can be a perfect fit as you will be able to:

• Work on the same docs, have them versionned and backed up.
• Create your own information or idea libraries with the wiki feature.
• Assign tasks to each other.

Application requires Apache, Java and Subversion to be installed. Desktop application has Windows, Mac and Linux versions which makes everything much better.

Tip: Mindquarry has a XAMPP download in the downloads section that automatically installs Apache, Subversion and Perl to prepare the application environment.

Calendars are one of the "musts" in most of the web applications.

Plans is a calendar script which has a simple yet functional interface.

Multi-day event support is one of the rarely found feature that can be found in other calendar applications. Without it, you simply need to hack the logic of the applications.

Another great feature is the powerful recurring events support which makes the administration of the calendar much more easier.

You can also password protect events, create multiple calendars with 1 installation and calendars can share information between each other and even customize the look of every calendar.

To summarize, you should check this calendar application .