Most Popular Cross-Platform and Free Software’s
Google Earth
Google Earth lets you browse anywhere on Earth to view satellite imagery, maps, terrain, 3D buildings, from galaxies 
in outer space to the canyons of the ocean.
Mozilla Firefox
Firefox 3 has new features including the smart location bar, one-click bookmarking and fast performance. It is designed to run on both Linux and Windows. There are fewer issues with spyware, adware and pop-ups making it far more secure than Internet Explorer.
Skype
Skype can be used to communicate with other Skype members. Skype is free to call anywhere in the world regardless of location and time.
FileZilla
FileZilla is a fast and reliable cross-platform FTP, FTPS and SFTP client with lots of useful features and an intuitive graphical user interface. It supports resume and transfer of large files, contains powerful site manager and transfer queue and much more.
OpenOffice
OpenOffice is the leading open-source office software suite for word processing, spreadsheets, presentations, graphics, databases and more. It is available in many languages and works on all common computers. It stores all your data in an international open standard format and can also read and write files from other common office software packages.
Aptana Studio
Aptana Studio is the leading IDE for Today’s Web offering integrated language support for HTML, DOM, JavaScript and CSS. Customize your Studio with additional plug-ins’ for PHP, Jaxer, Ruby on Rails, Python, Adobe AIR, Apple iPhone and Nokia S60 development. For Java support, plug Aptana Studio into Eclipse.
Picasa
Picasa is a free digital photo organizer and editor. Picasa will simply help you to manage your photos in one place, and find photos you forgot you had. You can even eliminate scratches & blemishes, fix red-eye, crop and more with Picasa.
VideoLAN
VLC media player is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, mp3, ogg, …) as well as DVDs, VCDs, and various streaming protocols.
BitTorrent
BitTorrent 6 is a client that transfers large videos, audios or softwares in a faster and cheaper way. A ‘client’ in this case is a computer program that follows the rules of a protocol.
Gimp
GIMP is an acronym for GNU Image Manipulation Program. It is a freely distributed program for such tasks as photo retouching, image composition and image authoring.
Thunderbird
Thunderbird makes it easier to prioritize and find your important email with tags and new find bar which assists you in searching.
