We thought SourceForge was a little out-dated, so we've moved to Google Code. Sorry SF!
Earlier it was noted that Smarty had been implemented (https://sourceforge.net/forum/forum.php?forum_id=800889). However, it is no more.
Since SnowCMS is in a current total rewrite, Smarty has been dropped. We are now using our own template system. It is in PHP however you need very very little PHP Knowledge to make a template, one major upside to no more Smarty is that this template system has "fall back". Which means when someone creates a theme for SnowCMS they don't have to make a file for EVERYTHING, instead of making like post.tpl, page.tpl, news.tpl, for each separate theme, this one enables you at the minimum to only have 1 file! Main.template.php file is the main one, it includes the header and footer of the site, while a theme maker can still make all the *.template.php files or a few for more control they don't have to!
Now that Ian (nscnet) has joined the SnowCMS team as a developer, SnowCMS has gone under a complete rewrite, and now has a templating system! We will release v0.7 once we have the basic components done. :)
Well, I've decided to integrate the Smarty template engine into SnowCMS. Hopefully, this will make many web designers happy. You don't have to type any PHP code, all of the code is easy and HTML-like. Smarty support is very basic at the moment, as I only started on it 2 hours ago, but at least it's working. :P
I commited the first revision to SVN this night. Currently I have only implemented the user system and the posting system. I have many more improvents to make, and I still have to write the installer and the admin panel, so please stay with me! If you would like any specific features added, file it Feature Requests (https://sourceforge.net/tracker/?group_id=220531&atid=1049823). Thanks!
I've made SnowCMS a project on SF! As soon as I get the project approved, I'm gonna put up the current code on SVN. I'll try to get Trac running as well, but I'm not sure if you can run that on SF. :/