The free, open source Extended WPF Toolkit is updated multiple times a year and is widely used. For professional developers that need the latest and greatest, and want to have the most complete set of controls and features possible, with updates and technical support, Xceed Toolkit Plus for WPF is the upgrade to get. -Xceed Toolkit Plus for WPF is at least one release ahead, so you get the latest bug fixes and improvements months in advance. It also provides additional controls and features, and a 1-year subscription which includes updates and technical support. For developers that want the ultimate datagrid control for WPF, a more feature rich version of the one provided in Extended WPF Toolkit and Toolkit Plus is available when you get Xceed Business Suite for WPF. +Xceed Toolkit Plus for WPF is at least one release ahead, so you get the latest bug fixes and improvements months in advance. It also provides additional controls and features, and a 1-year subscription which includes updates and technical support. For developers that want the ultimate datagrid control for WPF, a more feature rich version of the one provided in Toolkit Plus is available when you get Xceed Business Suite for WPF.