LINK:http://www.webi.org/osalternative.html
Open Source Alternative
Business / Office
Commercial Software Open Source Replacement
* Microsoft Office
* Microsoft Word
* Microsoft Excel
* Microsoft Money
* OpenOffice.org (Win, Linux, OS X)
* Abiword (Win, Linux, OS X)
* Gnumeric (Win, Linux)
* Grisbi (Win, Linux)
Graphic
* ACDSee
* Imgv (Win, Linux, BSD, OS X)
* Cornice (Win, Linux)
* Adobe After Effects
* Jahshaka (Win, Linux, OS X)
* Adobe FrameMaker
* QuarkXPress
* Scribus (Win, Linux, OS X)
* KWord (Linux, BSD)
* Adobe Illustrator
* Corel Draw
* Inkscape (Win, Linux, OS X)
* Skencil (Linux)
* Xara Xtreme for Linux (Linux, BSD, OS X)
* Adobe Photoshop
* Corel Paint Shop Pro
* GIMP (Win, Linux, OS X)
* CinePaint (Win, Linux, BSD, OS X)
* Paint.NET (Win)
* Krita (Linux, BSD)
* Adobe Premiere
* Microsoft Movie Maker
* Avidemux (Win, Linux, BSD, OS X)
* VirtualDub (Win)
* Cinelerra (Linux)
* Kino (Linux)
* Anime Studio
* Toon Boom Studio
* KToon (Linux)
* Synfig (Linux, OS X)
* Autodesk 3ds Max
* Autodesk Maya
* Blender (Win, Linux, BSD, OS X)
* Autodesk AutoCAD
* QCad (Win, Linux, OS X)
* BRL-CAD (Win, Linux, BSD, OS X)
* Corel Trace
* Potrace (Win, Linux, BSD, OS X)
* Adobe Flash Professional
* OpenLaszlo (Win, Linux, OS X)
* IMPRESS (Win, Linux)
* Macromedia Freehand MX
* Inkscape (Win, Linux, OS X)
* Skencil (Linux)
* Karbon (Linux, BSD)
* Microsoft Publisher
* DRAW (Win, Linux, OS X)
* Scribus (Win, Linux, OS X)
* Microsoft Visio
* Dia (Win, Linux)
* ArgoUML (Win, Linux)
* DRAW (Win, Linux, OS X)
* Kivio (Linux, BSD)
* StarUML (Win)
* Pixar RenderMan
* Blender (Win, Linux, BSD, OS X)
* Pixie (Win, Linux, OS X)
Internet / Networking
* Check Point VPN-1
* OpenVPN (Win)
* Citrix Presentation Server and Microsoft Remote Desktop for Windows
* Vine Server (OS X)
* CommView
* Wireshark (Win, Linux, OS X)
* CuteFTP
* WS_FTP Professional
* FileZilla (Win)
* WinSCP (Win)
* Cyberduck (OS X)
* FeedDemon
* RSSOwl (Win, Linux, OS X)
* Mozilla's Thunderbird (Win, Linux, OS X)
* HP OpenView Network Node Manager
* OpenNMS (Win, Linux, BSD, OS X)
* NeDi (Win, Linux)
* Nagios (Linux)
* Pandora FMS (Win, Linux)
* ICQ
* MSN Messenger
* Pidgin (Win, Linux)
* Miranda IM (Win)
* Adium (OS X)
* Psi (Win, Linux, OS X)
* Microsoft Internet Explorer
* Firefox (Win, Linux, OS X)
* SeaMonkey (Win, Linux, OS X)
* Microsoft Internet Information Services
* Apache HTTP Server (Win, Linux)
* Microsoft Outlook
* Thunderbird (Win, Linux, OS X)
* SeaMonkey (Win, Linux, OS X)
* Evolution (Linux)
* Microsoft FrontPage
* NVU (Win, Linux, OS X)
* mIRC
* XChat (Win, Linux)
* Skype
* WengoPhone (Win, Linux, OS X)
* Symantec Norton Personal Firewall
* WIPFW (Win)
* VanDyke SecureCRT
* PuTTY (Win, Linux)
* Poderosa (Win)
Multimedia
* Adobe Audition
* Audacity (Win, Linux, OS X)
* Ardour (Linux, OS X)
* Adobe EncoreDVD
* DVDStyler (Win, Linux)
* iTunes
* Windows Media Player
* Winamp
* Songbird (Win, Linux, OS X)
* musikCube (Win)
* Banshee (Linux)
* Amarok (Linux)
* PowerDVD
* WinDVD
* MPlayer (Win, Linux, OS X)
* VLC media player (Win, Linux, OS X)
* Fraps
* Taksi (Win)
* Windows XP Media Center Edition
* MediaPortal (Win)
* MythTV (Linux, OS X)
* Freevo (Win, Linux, OS X)
* Nero Recode
* HandBrake (Win, Linux, OS X)
* Steinberg Cubase
* Rosegarden (Linux)
* Ardour (Linux, OS X)
Security / Privacy
* Kaspersky Anti-Virus Personal
* Symantec Norton AntiVirus
* ClamWin (Win)
* Clam AntiVirus (Win, Linux, BSD)
* Winpooch (Win)
* Lavasoft Ad-Aware SE
* Winpooch (Win)
* Spybot Search & Destroy (Win)
* PGP Whole Disk Encryption
* TrueCrypt (Win, Linux)
Other Tools and Utilities
* Adobe Acrobat Reader
* Sumatra PDF (Win)
* Xpdf (Linux)
* Camtasia Studio
* Macromedia Captivate
* xvidcap (Linux, BSD)
* CamStudio (Win)
* Macrovision InstallShield
* Inno Setup (Win)
* Launch4j (Win, Linux, OS X)
* NSIS (Win)
* Nero Burning Rom
* Roxio RecordNow
* InfraRecorder (Win)
* Burn (OS X)
* Cdrdao (Win, Linux, BSD, OS X)
* K3b (Linux)
* Symantec Norton Ghost
* g4u (Win)
* Partimage (Linux)
* Symantec Veritas NetBackup
* AMANDA (Linux, BSD, OS X)
* Bacula (Win, Linux, BSD, OS X)
* UltraEdit-32
* Notepad++ (Win)
* jEdit (Win, Linux, OS X)
* SciTE (Win)
* WinRAR
* WinZip
* 7-Zip (Win, Linux, BSD, OS X)