Dia

Dia is a program to draw structured diagrams.It can be used to draw many different kinds of diagrams. It currently has special objects to help draw entity relationship diagrams, UML diagrams, flow charts, network diagrams, and simple circuits. It is also possible to add support for new shapes by writing simple XML files, using a subset of SVG to draw the shape.


Download link:- http://dia-installer.de/download.html

Sun VirtualBox

The world's most popular open source virtualization software

Turn your PC into an easy-to-use virtualization platform with Sun VirtualBox, the enterprise-class open source software that runs on all major operating systems.Sun VirtualBox supports any operating system as a guest OS, giving you the flexibility to develop applications on your platform of choice. Which means you can run Windows in a virtual machine on a Mac or Linux platform, or run Solaris OS and Windows applications right alongside Apple applications on your MacBook.Whether you're new to desktop virtualization technology or an experienced developer or OEM, Sun VirtualBox offers you a comprehensive range of support offerings.


Download link:- http://www.sun.com/software/products/virtualbox/get.jsp

DOSBox

DOSBox is an emulator which emulates an IBM PC compatible computer running MS-DOS. It is intended especially for use with old PC games. DOSBox is free software.


DOSBox is a full CPU emulator, capable of running DOS programs that require the CPU to be in either real mode or protected mode. Other similar programs, such as dosemu or VDMs for Windows and OS/2, provide compatibility layers and rely on virtualization capabilities of the 386 family processors. Since DOSBox can emulate its CPU by interpretation, it is independent of its host CPU. However, on systems which provide the i386 instruction set, the option to use dynamic instruction translation is available in DOSBox. Though this setting is less accurate and reliable, it is faster than interpretive CPU emulation.


Download link:- http://www.dosbox.com/download.php?main=1

Mozilla Thunderbird

Mozilla Thunderbird is a free, open source, cross-platform e-mail and news clientdeveloped by the Mozilla Foundation. The project strategy is modeled after Mozilla Firefox, a project aimed at creating a web browser. On December 7, 2004, version 1.0 was released, and received over 500,000 downloads in its first three days of release, and 1,000,000 in 10 days.


The latest version-Thunderbird 3 features the following:-

New Search with Advanced Filtering Tools

• New Search with Advanced Filtering Tools
  Search results now include advanced filtering tools. You have the option to filter your results by sender, tag, attachments, people, folder, and mailing list. You can also filter your email using the timeline tool.
• New Global Search Field with Autocomplete
  When typing in the Global Search field, Thunderbird autocompletes against your address book. You have the option of searching everywhere or filtering against different parts of the email such as by subject or by sender.

User Experience Improvements

• New Mail Account Setup Wizard
  The new Mail Account Setup Wizard matches against a database of email settings from popular mail providers so that you will only need to provide your name, email, and password to set up new mail accounts.
• Redesigned Mail Toolbar
  The Mail Toolbar is redesigned to include the new Global Search bar. Buttons such as reply, forward, delete, junk are part of each email message. You can add those buttons back to the main toolbar by customizing the toolbar.
• Tabbed Email Messages
  Double-clicking or hitting enter on a mail message will now open that message in a New Tab window. Middle-clicking on messages or folders will open them in a Tab in the background. When quitting Thunderbird, visible tabs will be saved and will be restored when you open Thunderbird the next time. There is also a new Tab menu on the Tab toolbar to help you switch between Tabs.
• Smart Folders
  The folder pane offers a Smart Folders mode which combines special mailboxes, like Inbox, from multiple accounts. Smart Folders is now on by default.
• New Message Summary View
  Selecting multiple messages will give you a summary view of the emails you have selected.
• Column Headings
  The column headings that are displayed and the order in which they are displayed can now be set on a per-folder basis.
• Message Archive
  You can now file messages from your Inbox or other folders into the new Archive folder system.
• Activity Manager
  The Activity Manager records all the interactions between Thunderbird and your email provider in one place.
• New Add-ons Manager
  The new Add-ons Manager (Tools > Add-ons) can now be used to find, download, and install Thunderbird Add-ons which includes Extensions, Themes, and Plugins.
• Improved Address Book
  If someone is in your address book, it is indicated by a new star icon which you can click to edit contact details inline. If they are not in your address book, you can add them with one click of the icon. A new birthday field allows you to keep track of your friends' birthdays. You can also add a photo for contacts in your address book.
• Improved Gmail Integration
  Better recognition and integration of Gmail's special folders such as Sent and Trash including non-English versions of Gmail. Thunderbird also uses All Mail as the Archives folder.
• For Windows Vista users, Thunderbird 3 is now integrated with Vista search results. On first start, Thunderbird will prompt to install its indexing system into Windows Vista and you can choose to see Thunderbird email and news messages in Windows search results.

• For Mac users, Thunderbird 3 is now integrated with Spotlight, can import from Mail.app, read your OS X address book, and use Growl for new mail alerts.

Performance Improvements

• IMAP Folder Synchronization
  Thunderbird will download IMAP messages by default in the background to allow for faster message loading and better offline operation. This feature can be enabled on an individual folder basis via Folder properties, or for all folders in an account via Account Settings / 'Synchronize & Storage'.
  Download link: http://www.mozillamessaging.com/en-US/thunderbird/

Audacity

Audacity is a free, easy-to-use and multilingual audio editor and recorder for Windows, Mac OS X, GNU/Linux and other operating systems. You can use Audacity to:

• Record live audio.
• Convert tapes and records into digital recordings or CDs.
• Edit Ogg Vorbis, MP3, WAV or AIFF sound files.
• Cut, copy, splice or mix sounds together.
• Change the speed or pitch of a recording.

Download link:- http://audacity.sourceforge.net/download/

Inkscape

An Open Source vector graphics editor, with capabilities similar to Illustrator, CorelDraw, or Xara X, using the W3C standard Scalable Vector Graphics (SVG) file format.

Inkscape supports many advanced SVG features (markers, clones, alpha blending, etc.) and great care is taken in designing a streamlined interface. It is very easy to edit nodes, perform complex path operations, trace bitmaps and much more. 

Download link:-http://www.inkscape.org/download/?lang=en

Azureus - now called Vuze

The bit torrent client with powerful torrent meta-search with login support for private trackers


Features

• Discover high quality content on the Vuze HD network
• Download quickly and efficiently with intelligent bandwidth, queue and speed management
• Sit back and savor the high-quality entertainment experience

Download link:-http://azureus.sourceforge.net/download.php