Basics

1. Windows Vista OS to Ubuntu OS

2. Internet Explorer Browser to Firefox Browser

Office Suites

3. Microsoft Office to OpenOffice

4. Mactopia to NeoOffice

Office Tools

5. MathWorks MATLAB to Scilab

6. Microsoft Access to Kexi

7. Microsoft Word to OpenOffice Writer

8. Microsoft Excel to OpenOffice Calc

9. Microsoft Visio to Dia

Productivity

10. Blackboard to Moodle

11. Box to Cabos

12. Microsoft Project to Open Workbench

13. Mindjet to FreeMind

Graphic Programs

14. Adobe Illustrator to Inkscape

15. Adobe PhotoShop to GIMP

16. Adobe Premiere to Avidemux

17. AutoCAD to Archimedes

18. Microsoft PowerPoint to OpenOffice Impress

19. Microsoft Paint to Tux Paint

Web Editors

21. Adobe GoLive CS2 to Mozilla SeaMonkey

22. Adobe Dreamweaver to NVU

23. Macromedia Flash Professional to OpenLaszlo

24. Microsoft Frontpage to Bluefish

25. Windows Notepad to ConTEXT

26. Altova XMLSpy to XML Copy Editor

Publishing

27. Adobe Acrobat to PDFCreator

28. Adobe Framemaker to DocBook

29. Microsoft Publisher to Scribus

Communications

30. AIM to Pidgin

31. FeedDemon to RSS Bandit

32. Microsoft MSN Messenger to aMSN

33. Microsoft Outlook to Thunderbird

34. Skype to Wengophone

Media

35. iTunes to Songbird

36. Nero Burning Rom to K3b

37. Quicktime to Darwin Streaming Server

38. TiVo Desktop to Galleon.tv

39. Windows Media Player to Miro

Utilities

40. CuteFTP to Filezilla

41. iBackup to ZManda

42. Norton Ghost to Partition Image

43. Rational Purify to Valgrind

44. WinZip to 7-Zip

Security

45. Kaspersky Anti-Virus Personal to Winpooch

46. McAfee VirusScan to ClamWin

47. Norton Personal Firewall to WIPFW

Financial

48. Authorize.net to OpenSSL

49. Microsoft Money (Plus) to TurboCash

50. Quickbooks to Compiere