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Here’s a list of 50 free alterative open source programs to the paid programs that you use, hope you may like it.

Basic

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: Another Microsoft office suite, but this time meant for MacIntosh computers. Try NeoOffice instead. NeoOffice® is a full-featured set of office applications, including word processing, spreadsheet, presentation, drawing, and database programs for Mac OS X. This suite is based on the OpenOffice.org office suite, but it has integrated dozens of native Mac features and can import, edit, and exchange files with other popular office programs such as Microsoft Office.

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
20. TruSpace to Blender

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

Liked the 50 free alternatives, please do write a comment to what you feel.

Thanks

For description of each program please visit here