Angel Funding for Non-Profit Startups?

The start-up focuses on addressing a significant gap in the security of human rights organisations, journalists and activists - through the use of an opensource android application. It builds on years of cutting-edge security operations in this field. We are currently developing it in our spare time but am looking to find early stage Non-Profit "angel" type investors. If anyone can suggest such organisations, programs or individuals, that would be great. Secfirstmd@gmail.com