We are in the process of moving to github, but it is not a high priority right now and we have so many things to reconfigure in our servers that it is not going to happen until March at the earliest. Meanwhile you can use svn:

svn co svn://svn.code.sf.net/p/jolie/code/trunk jolie-src

You can also browse the code here:

https://sourceforge.net/p/jolie/code/HEAD/tree/