Is there any software that can send SMS messages in groups for free?

Generally speaking, there is no real free software. For example, Fetion, a communication service launched by China Mobile, can send short messages for free (provided that both parties are friends). If you are not a friend, send a text message to the other party and charge it according to the normal communication fee. But fetion is rarely used now.

Similar to group software's short message with the slogan of free, there are Yixin (jointly developed by Netease and China Telecom) and Michao (produced by Xiaomi Technology). However, these softwares are still not really free, and there are still some restrictions.

You can cooperate with 106 SMS service provider here (the price of mass SMS is 3~6 cents/article), and you can send SMS with a small amount of money!