Yotta

Yotta is a scheduling program for telephone and online organizations. With this app you can volunteer always tell when you are scheduled.
If you are unable to attend for your phone or chat service while the grid is already final, shows the app suggestions for volunteers who can take over your service. From the app you can directly call or e-mail.
You can only use this app if you already have a username and password.
Scheduling and modifying services do through www.yotta.nl.