Some links to know about Open Source..

[SemicolonValley]

What is Open Source Software?

The Open Source Definition
http://www.opensource.org/docs/osd

Open source software - Wiki
http://en.wikipedia.org/wiki/Open_source_software

Alternative Open Source Software

Linux Alternative Project (formerly the Linux Equivalent Project).
http://www.linuxalt.com/

Free and open-source software is good for you and for the world. This
is the best Windows software that we know of. No adware, no spyware,
just good software.
http://www.opensourcewindows.org/

Find open source software alternatives to well-known commercial
software
http://www.osalt.com/

Slowly Shift towards the OPEN SOURCE SOFTWARES and Operating Systems.
Better start with the Application you use.

App Proprietary Open Source
Office Application MS- OFFICE OpenOffice.Org
Graphics Editor Adobe Photoshop The GIMP
Vector Graphics Corel Draw InkScape
Media Player WMP, Winamp, Power DVD MediaPlayer Classic, VLC