Infragistics has made some of their NetAdvantage Windows Forms/ASP.NET controls available for free.
The package, available for download through this special offer, contains the folowing Windows controls: WinTab, WinScrollBar, WinProgressBar, WinPrintDocument and WinToolTip. ASP.NET controls include WebCalendar and DateChooser.
Free controls are taken from NetAdvantage 2005 Vol. 3 and are built for .NET 2.0.
Read more about this offer.