Ask HN: Free Collaboration Tools for Non Profits?

I need online storage where a small group of non-technically minded people can collaborate. Google Drive and Dropbox doesn't cut it because those services are tied to a specific user. I want shared storage - not one user sharing with the rest of the team. And one user whose password everyone shares is right out. There is Google for Nonprofits, but the signup process is downright Kafkaesque. Any other options?