Useful Open Source Multimedia Softwares

Today Open Source (OS) software is becoming more competitive than ever. If you can't buy multimedia programs like: Photoshop, BSR Screen Recorder, Soundforge and many more, then just use OS counterparts (of course if you can buy it, then you it's up to you). Please don't use them illegally (I mean cracks and keys). So here is my suggestion:

paint.net (picture editing program) 

Download: http://www.getpaint.net/download.html
For more information: http://www.getpaint.net/features.html 

CamStudio (screen capturing program) 

Download: CamStudio
For more information: http://camstudio.org/

Audacity (audio editing program) 

Download: http://audacity.sourceforge.net/download/
For more information: http://audacity.sourceforge.net/about/