Each user, depending on his / her permissions, can create a shift, insert / remove his name, view all the shifts in a month and in a day, verify his future commitments.
Volontari@Mente can also alert you (with a notification or an e-mail) of a change that affects you, and can also set an alarm on your device's calendar to alert you in advance of the incoming shift.
An online help provides you with the essential information you need to use the app.
Also a user manual can be downloaded (Italian only) from: www.sundials.eu/VolontariaMente/Manuale%20utente%20-%20Volontari%40Mente.pdf.
App usage requires creating a dedicated space on a server for each registered association.
Contact the author for more information.