The primary purpose of the DotNetNuke WebControls project is to allow developers to utilize feature-rich controls in their applications without the associated cost or distribution restrictions associated with commercial controls. All controls utilize the ClientAPI, and therefore support a rich client side object model, work cross-browser, and utilize AJAX functionality.

The DotNetNuke TreeView control is an open-source ASP.NET WebControl that has a rich client-side object model and supports advanced featuresets like populate on demand and keyboard navigation.
The DotNetNuke Menu control is an open-source ASP.NET WebControl that has a rich client-side object model and supports advanced featuresets like populate on demand and keyboard navigation.
The DotNetNuke Label Edit control is an open-source ASP.NET WebControl that allows any label to be editable on the client where it uses a client-callback to persist the changes. Simply specify a client-side event like onclick to allow the user to edit. It supports RichText and MultiLine editing.
The DotNetNuke Text Suggest control is an open-source ASP.NET WebControl that allows any textbox to suggest the results the user is looking for by dynamically populating a menu of matched items.
The DotNetNuke Tab Strip control is an open-source ASP.NET WebControl that allows a page to be displayed in a tabular manner. It supports 3 rendering modes, including AJAX on-demand loading to allow for optimal performance.
The DotNetNuke ToolBar control is an open-source ASP.NET WebControl that allows a toolbar to be attached to any control.