Partimus.org is a Bay Area non-profit organization which provides repurposed computers running free software to students and schools who need them.
The organization now works with 6 schools in the bay area by providing hardware and Ubuntu LTS deployments and support. The current infrastructure for the labs can be found in the School Lab In A Box Guide, prepared by Partimus volunteers.
Christian Einfeldt will regularly email the mailing list with requests for local volunteers.
Volunteer opportunities arise during weekdays and weekends, and frequently pizza is supplied to the volunteers.