The GWT SDK contains the core libraries and compiler that you need to write web applications. See the Release Notes for this latest version.
Note - This download contains the standalone GWT SDK and tools only. If you're using Eclipse, we suggest that you download and install the Google Plugin for Eclipse instead.
The Google Plugin for Eclipse provides IDE support for the GWT and App Engine web projects, and includes a lightweight version of GWT Designer.
Note - This download includes Eclipse tools as well as the option to install the GWT SDK and App Engine SDK.
Note - GWT release candidates are not bundled with The Google Plugin For Eclipse. Download the SDK and add it to your workspace as described here.