DataONE, one of the DMPTool collaborators, provides five NSF sample plans on their Data Management Planning page.
UC San Diego Example Data Management Plans page has sample plans for all Directorates.
The NIH provides examples of Data Sharing Plans as well as more information on goals, definitions, FAQs, etc. on their NIH Data Sharing Policy page.
These Sample Applications from the NEH include Data Management Plans:
A unified approach to preserving cultural software objects and their development histories (pdf)
TOME:Interactive TOpic Model and MEtadata Visualization (pdf)
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