We need to schedule appointments for a volunteer-based free tax service. Formerly used a free version of GenBook. Since it is no longer free, we need an alternative. Need to manage multiple providers, 3 or 4 services with preset time length, and a schedule of dates and times. Would like to generate an email back to client confirming appointment and one to manager. Will only need to schedule for Feb 1 thru Apr 15th. Could potentially be used by over 1,100 volunteer tax sites nationwide. This is a non-profit organization.