Abiro SMS makes it easy to send SMS via a web form, e-mail or API to groups of people.
Sending SMSs (whatever the route) is based on topping up Funds.
Templates enable you to preconfigure messages and destinations for recurring messages.
Destinations enable you to create lists of destinations beforehand.
Detailed statistics provide traceability.
If you have more advanced messaging needs, possibly beyond SMS, check out CliqTags Messaging.