The following funding agencies have open access requirements pertaining to publications arising from your research and, increasingly, your data:
A number of funding agencies now provide platforms for open access publishing of funded research through the Open Research Central platform in collaboration with F1000 including:
These guidelines explain the rules on open access to scientific peer reviewed publications and research data that beneficiaries have to follow in projects funded or co-funded under Horizon 2020.
You may also find this FAQ document from the EU useful.
This guide by OpenAIRE is the complete guide for researchers and project coordinators on how to comply with the EC Open Access Policies in Horizon 2020 and FP7. More Information here on the OpenAIRE Website. The FP7 (Framework Programme for Research and Technological Development projec,2007-2013) OpenAIRE aimed to support the implementation of the EC and ERC Open Access policies. It has now been succeeded by OpenAIREPlus.
Here are some links to the open access policies, statements and resolutions of a number of organizations and institutions.