Below is a list of FREE software that can be downloaded. 

1. Audacity

http://audacity.sourceforge.net/download/

2. Tuxpaint

http://www.tuxpaint.org/download/

3. TuxStamps

http://www.tuxpaint.org/stamps/

4. TuxMaths

http://tux-of-math-command-tuxmath.en.softonic.com/

5. CamStudio

http://camstudio.org/

6. Process Explorer

http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx

7. Cute PDF

http://www.cutepdf.com/products/cutepdf/Writer.asp

8. Inkscape

http://www.inkscape.org/download/

9. Paint.NET

http://www.getpaint.net/download.html

10. Silverlight

http://www.microsoft.com/silverlight/get-started/install/default.aspx

11. Adobe Reader

http://get.adobe.com/uk/reader/

12. Flash Player

http://get.adobe.com/flashplayer/

13. Java

http://www.java.com/en/download/manual.jsp

14. Shockwave

http://get.adobe.com/shockwave/

15. Tux Type

http://tux4kids.alioth.debian.org/tuxtype/download.php