1. Effebot: Effebot offers an easy-to-use voice broadcasting software that allows you to send personalized, automated voice messages to a large number of recipients.

2. Twilio: Twilio provides a comprehensive API-driven communication platform that includes voice messaging capabilities. It allows you to create and automate voice broadcasts using their APIs.

3. DialMyCalls: DialMyCalls offers a user-friendly voice broadcasting service that enables you to send automated voice messages to groups of recipients. It also provides various features like recipient tracking and reporting.

4. CallHub: CallHub provides a cloud-based voice broadcasting service that allows you to create and schedule automated voice messages. It offers features such as message personalization and real-time analytics.

5. Easy Voice Broadcast: Easy Voice Broadcast is a web-based automated voice message service that enables you to send voice messages to a large audience quickly and easily. It offers features like contact management and message scheduling.

These services typically allow you to record or upload pre-recorded messages, select the recipients, and schedule the time of broadcast. They are commonly used for notifications, reminders, alerts, marketing campaigns, and more.