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Free and open-source software are getting more and more acceptance in the corporate environment due to their high quality, and, obviously, their low cost.
While it might be early to deploy full-blown Linux desktops in your company, here is a list of handy free or open-source tools running on Windows that can effectively replace more costly alternatives:

Use Free or open-source software where possible:

1. Use 7zip or PeaZip instead of WinZip or WinRAR
2. Use PDFCreator to generate PDF files
3. Use Picasa to manage your pictures and photos
4. Use Paint .NET to work on your photos and pictures
5. Use GanttProject to manage your projects
6. Use XMind to organize your thoughts and ideas
7. Use KeePass to keep your passwords safe
8. Use Eraser to securely remove sensitive files (be careful, no recovery possible !)
9. Use SyncToy to synchronize your files and make backups
10. Use InfraRecorder to write and copy CDs and DVDs