NirSoft offers a large collection of freeware

Highlights:

• Mail PassView - Recover the passwords of popular email clients
  
• IPNetInfo - Find all available information about an IP address:
• NirExt - Change the icon of any folder in your file system, Easily create shortcuts on your start-menu/desktop.
• WinUpdatesList - Displays the list of all Windows updates (Service Packs and Hotfixes) installed on your local computer.
• ShellExView - Displays the details of shell extensions installed on your computer, and allows you to easily disable and enable each shell extension.
• SysExporter - Grab the data stored in standard list-views, list boxes, and combo boxes from almost any application running on your system, and export it to text, HTML or XML file.
• ProduKey - Recover Office/Windows CD-Key
  

Link:
http://www.nirsoft.net/