Isn't there any software that can send short messages online?

1, iUU free SMS software, iUU is the first mobile phone software that uses Internet technology to realize unlimited free SMS, voice and MMS. Support. Net and wifi, mobile, Unicom and telecom users can send messages to each other for free, regardless of international or domestic roaming. You can send and receive messages without adding friends, and the operation is simple. 2, a letter, a letter is a free SMS sending software based on mobile phone address book. SMS and instant messaging are perfectly integrated, and they can communicate freely with friends via SMS, MMS and voice across communication operators and operating system platforms. When both parties are trusted users and online, they can easily communicate with their friends in real time without paying SMS and MMS fees, but only by paying a small amount of traffic fees.