my social service agency (not bike related) uses it. it's very sophisticated and thorough and if you're just looking to keep track of volunteers, you might be better off using something else. i think you can get a free trial and check out the services for a while w/ no commitment. i know the recyclery Chicago uses something that a a local volunteer created. contact folsk there to see fi they can give you that program. very basic volutneer tracking/orientation.
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froilan eliseo landeros
The Recyclery Collective
7628 N Paulina
Chicago, IL 60626
773.262.5900
froilanderos@therecyclery.org