mySMS is an easy-to-use backup and sync application that allows users to securely back up, sync, and store their important text messages and multimedia messages (MMS) across multiple devices. The app is designed to provide users with a convenient and secure way to access and share their messages with family and friends. mySMS allows users to store their messages in the cloud, download them to any device, and even share them with others. The app also includes a powerful set of features such as message search, backup scheduling, and password protection. With mySMS, users can rest assured that their messages are safe, secure, and always available.
Requires internet for both parties.
Discontinued Apps are no longer updated. The latest version, 4.0, released in December 2014, is still available for download from Apple Appstore and Google Play Store
Discontinued It seems that the application is no longer maintained: it is no longer on Google Play Store and the site http://desksms.appspot.com/ is not working. The APK can be downloaded from http://www.clockworkmod.com/ and the source code can be found at https://github.com/ClockworkMod/DeskSMS
Hangouts only allows cross-platform SMS access from a Google Voice number.