As continuation of migration to Subversion, Gammu now also uses Subversion as version control. This is now pretty standard version control system, so you can easily use latest development source.
Besides this, using Subversion brings us possibility to use various free services to work with this repository.
If you want to follow development, you can use RSS feeds on CIA.vc. For code statistics hungry people, there is Ohloh service, which directly analyses repository.
There might be also other useful tools, if you want some integration, just tell me.