Yes, there are several free software options available for SMS blasting. Here are a few examples:
1. Google Sheets with Twilio: You can create a Google Sheet with a list of phone numbers and messages, and then use a tool like Twilio to send out the SMS blasts.
2. Textlocal: This is a cloud-based SMS marketing platform that offers a free trial and affordable pricing for businesses of all sizes.
3. Atomic SMS Sender: This is a free SMS blasting software that allows you to send SMS to up to 10 recipients per day.
4. SMS Gateway: This is a free and open-source SMS gateway software that you can install on your own server.
It's important to note that SMS blasting can be regulated in some countries, so make sure to check the laws and regulations in your area before sending out mass text messages.