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If you are looking open source software for your bussines, may be you cant look it easily. I suggest you to see these software. There are :

•    OpenOffice same as microsoft Office
•    GIMP same as Adobe Photoshop
•    Inkspace same as Corel Draw
•    QCad,OCTREE, DIA (Diagram), alternate of AutoCAD
•    Synfig Studio same as Macromedia Flash/Adobe Flash
•    Blender same as 3D Max
•    Gambas, Gambas2 same as Visual Basic
•    Lazarus, Kylyx(discontinue) same as Delphi
•    Netbeans (Java) This software can used in Linux and windows with compatible version.
•    GNU C Compiler (GCC) compiler C at Linux
•    G++ Compiler C++ at Linux
•    Brasero, K3B same as Nero Burning
•    Nero 3 for Linux
•    Gmount-iso, Gisomount same as Daemon, virtual CD =>you can used with this task : mount -o loop -t
•    Virtualbox,Qemu,Xen same as Virtual PC, VMWare
•    VMWare for Linux
•    Xmms same as Winamp
•    Totem Movie Player same as Windows Media Player
•    Xine same as Power DVD and the others
 •    GNASH same as Flash Player
•    Audacity audio editor for Linux.
•    Kino same as ULEAD VIDEO EDITOR
•    KGet, wget, Multiget same as Flashget, IDM,and getright (Download Manager)
•    Pidgin as used like Yahoo Messengers
•    Firefox, Opera same as Internet Explorer (IE)
•    ThunderBird, Evolution same as Outlook express
•    Bittornado For downloadin torrent file
•    Wine, Crossover used for execute windows software at Linux anviroment.
•    Cedega used for execute windows game at Linux anviroment.
 •    XFE same as windows explorer filenya GNOME/KDE .
•    Compiz+emerald  desktop used.
•    XChat, BitchX same as mIRC
•    Gwenview, Digikam same as ACDSee
•    Quanta, NVU same as Dreamweaver
•    Quantum GIS same as ArcGIS, MapINFO (GIS Software)
and then whats your choice? open soucre or propertary software.