The free, open source Community Edition is provided here on CodePlex under the Microsoft Public License and without technical support. The Plus Edition is at least one release ahead, adds additional controls and features, and if you get the 1-year subscription, includes technical support and updates. There is also Xceed Business Suite for WPF which adds the full-featured version of the industry's best datagrid: Xceed DataGrid for WPF.
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+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, Xceed Toolkit Plus for WPF is the upgrade to get. + +Also known as the Plus Edition, Xceed Toolkit Plus for WPF is at least one release ahead, adds additional controls and features, and if you get the 1-year subscription, includes technical support and updates. For developers that want the ultimate datagrid control for WPF, which is a highly feature rich version of the one provided in Extended WPF Toolkit, there's Xceed Business Suite for WPF. +
Here is a detailed table with the features in each edition: