The homepage for Solfege is http://www.solfege.org. There is also a smaller page with more static info at http://www.gnu.org/software/solfege/.
The source code is available from http://ftp.gnu.org/gnu/solfege. If you are adventurous, you can try the unstable (buggy, but might contain new stuff) releases from http://alpha.gnu.org/gnu/solfege. These releases might have more bugs, but then you get the chance to try new stuff and find and report bugs.
Source code and some precompiled binaries are available from http://sourceforge.net/project/showfiles.php?group_id=1465
If you run Debian you can apt-get install solfege to download and install the program.
Very low traffic, moderated and will be used to announce stable releases of Solfege. (Subscription | Archive)
If you want to report problems installing or running Solfege, or have questions, comments or ideas on how to improve Solfege, please post to this list instead of using the message forum at Sourceforge or the author directly. You can post to solfege-devel without subscribing. (Subscription | Archive)
The standard GNU address to send bug reports. This list is at the moment forwarded to <solfege-devel@lists.sourceforge.net>