This is sad news as this he has obviously made some really great software and shared it with the community. At the risk of threadjacking - I am always curious

This is sad news as this he has obviously made some really great software and shared it with the community. At the risk of threadjacking - I am always curious how evince and others are funded (if at all)? Is it corporately sponosored, completely volunteer, backed by a foundation. And following that up, if it is backed by a foundation, which ones generally give the most? Just trying to figure out how the money for opensource relates to things I know and use everyday.