I would also suggest donating only to non-profits that make everything they do as open/transparent/public domain as possible.

In my limited experience there seems to be a correlation between an organization's productivity in solving their existential problem and how open the org is.

The more secretive the organization (and the less public domain content it produces) the more likely it spends a significant amount of its resource on fundraising and cushy salaries for its management.

Allen Institute, Wikimedia, Internet Archive, are examples where $1 in inputs leads to $100 in public domain output.