E-commerce
Visit Symphero at http://sourceforge.net/project/showfiles.php?group_id=4295 For an Open Source E-commerce Suite for Linux and other UNIX-based operating systems.

Visit http://www.fishcart.org For an Open Source Shopping Cart Solution written in PHP4 (Windows NT, Unix and Linux Platforms).

Development:
Visit Xinox JCreator at http://www.jcreator.com/download.htm For a powerful Java IDE editor.

Visit Macromedia Dreamweaver Downloads at http://www.download.com/Macromedia-Dreamweaver/3000-2048_4-10225092.html For a complete tool kit for web design.

Antivirus & Security:
Visit Clam antivirus at http://www.clamav.net For a powerful scanner and scheduler for Windows, plus adding protection for your Internet Explorer.

Visit Security and Privacy Complete at http://sourceforge.net/projects/cmia For a security tool for Windows. Disable services that are considered security risk for your computer with just a few clicks.

Visit File Scavenger Tool Download at http://www.quetek.com/download.htm, for a popular and reliable computer forensics tool for recovering deleted files in your computer( Even after they have been deleted from the Recycle Bin).