10.9 use the Service or Content with any products, systems, or applications for or in connection with:
(a) real time navigation or route guidance, including but not limited to turn-by-turn route guidance that is synchronized to the position of a user's sensor-enabled device; (b) any systems or functions for automatic or autonomous control of vehicle behavior; or (c) dispatch, fleet management, business asset tracking, or similar enterprise applications (the Google Maps APIs can be used to track assets (such as cars, buses or other vehicles) as long as the tracking application is made available to the public without charge. For example, you may offer a free, public Maps API Implementation that displays real-time public transit or other transportation status information. If your Maps API Implementation is deployed internally or you are charging for use of your Maps API Implementation, please contact the Google Maps API Premier sales team for more information);
My advice would be to contact Google and ask them about your specific set of circumstances. I am not a lawyer and this is not legal advice.
I'm not an expert, but a quick google found GWT-Ext, where it looks like they're using OpenStreetMap data which is free to use in a commercial application.
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Openlayers 是免费软件，http://openlayers.org/；它在这里有一个 GWT 插件： http://sourceforge.net/projects/gwt-openlayers/
根据 Google 的许可 (http://code.google.com/apis/地图/terms.html）：
我的建议是联系 Google 并询问他们您的具体情况。我不是律师，这不是法律建议。
Openlayers is free software, http://openlayers.org/; it has a GWT plugin here: http://sourceforge.net/projects/gwt-openlayers/
As far as Google's License (http://code.google.com/apis/maps/terms.html):
My advice would be to contact Google and ask them about your specific set of circumstances. I am not a lawyer and this is not legal advice.
如果您正在寻找完全开放的数据，您可能需要查看 OpenStreetMap.org 他们在其 常见问题解答 他们从中提取开放数据。
If you are looking for full open data you might want to check out OpenStreetMap.org they list in their FAQ where they pull their open data from.
我不是专家，但快速谷歌发现GWT-Ext ，看起来他们正在使用 OpenStreetMap 数据，该数据可以在商业应用程序中免费使用。
I'm not an expert, but a quick google found GWT-Ext, where it looks like they're using OpenStreetMap data which is free to use in a commercial application.