Cover Crop Selection Tool
The Natural Resource Conservation Service has developed a cover crop selection tool for the Southeast (Excel spreadsheet). This was developed for row crop production, but will give you a starting point.
The Plant Materials Technical Note No. 1 (.pdf) will give you information on how to use it.
You can also visit the Cover Crop Information Sheets page for more information. In the near future, we hope to have an interactive cover crop selection tool for you to use.