Today the CyanogenMod team announced their secure messaging system that is being integrated into their CM 10.2 nightlies (will soon follow into their CM 11 branch). Dubbed as WhisperPush, the system-wide secure messaging system is powered by TextSecure. This basically encrypts your SMS messages both locally and over- the-air when sending to other TextSecure users.
The source is of course made available to the public. Check out the link below for CM’s official word on the matter and for further information.