Friends & Foundation of the San Francisco Public Library
The SF Library system is pretty amazing. Not only are they one mega, open source of information and learning in the sense of lending books, music, etc., but they also have all kinds of others programs to support the community. It is also one of the few places people can go and use computers for free. Finally, it often doubles as safe space for at risk youth and the homeless population.
San Francisco Marin Food Bank
Collects and distributes more than 1 million pounds of food throughout the Bay Area EACH WEEK. They are feeding thousands of families, many of which are struggling to pay high local rents, etc.
BUILD's mission is to use entrepreneurship to excite and propel disengaged, low-income students through high school to college success. In 2002, BUILD became a key player in school districts when it went into local high schools and began offering its entrepreneurship curriculum as a daily, credited class. By working closely with the partner schools and their teachers, BUILD began supplementing students' traditional education with the real-life experience of running their own small businesses.