SoftClicks!

Open Source mac alternatives

• http://www.opensourcemac.org/

Open Source Software for windows users

• http://osswin.sourceforge.net/
• http://www.opensourcewindows.org/

List of Open Source software

• Wikipedia List
• An Untested List of Open Source Softwares
• W3C certified Open Source Softwares
• More Open Source Alternatives
  

Free and Open Source Software alternatives for every one

• http://nextdoornerd.blogspot.com/FOSS

Open Source Telephony and VOIP

• Asterisk - Open Source PBX and Telephony platform
• X-Lite - Worlds favorite free soft phone