Source files for all releases can be found here.
Packages for Ubuntu can be found here.
Packages for OpenSUSE can be found here.
There is a daily subversion checkout as tar.bz2 archive here.
Daily build packages for Ubuntu can be found here.
$ tar xfz rawstudio-x.y.tar.gz
$ cd rawstudio-x.y
$ ./configure
$ make
$ sudo make install
Anonymous checkout of active development tree is possible here.
$ svn co https://rawstudio.org/svn/rawstudio/trunk/ rawstudio # or branches/vX.Y/
$ cd rawstudio
$ ./autogen.sh
$ make
$ sudo make install