FreeTextBox (FreeTextBox.com)
FreeTextBox is the next generation of the most popular cross-browser HTML editor for ASP.NET. It includes different languages, themes, and styles. You can edit everything from text, to fonts, to colors, and more.
http://www.freetextbox.com/
EasyWebEdit.Net (EasyWebEdit)
EasyWebEdit.net is a WYSIWYG editor for ASP.NET. Some of the features include word processing functionality, table dropdown menu, ability to change cell and table properties, full integration with VS.NET, ability to add images, redo and undo, file manager, themes, print preview, and the ability to toggle between break and paragraph mode.
http://www.easywebedit.net/
Snap Control (ComponentArt)
Many web portals have a drag and drop feature where portlets can be moved, docked, resized, aligned, expanded, and collapsed. Add that functionality to your website using the ComponentArt Snap control
http://www.componentart.com/snap/
Fluent.ControlFocus (fluent Consulting)
ShowHideButton (Gokhan Altinoren)
The ShowHideButton control allows a developer to show or hide content based on a click event. This can be useful for creating your own wizard control or for showing and hiding additional information.
http://altinoren.com/showhidebutton.htm
LocateIP .Net (LocateIP .com)
This control can be very useful if you'd like to track the IP and country of your visitors. This can help prevent fraudulent users from accessing your site, and help determine what address form you need to display.
http://www.locateip.com/
Farside.ProgressBar (Farside Studios)