I don't know... TimmyH79 reported something very similar in another thread.
It may have been a temporary Subversion/SourceForge glitch?
Try
$ SVNURL="https://reprap.svn.sourceforge.net/svnroot/reprap/trunk/reprap"
$ svn co $SVNURL/firmware
at a shell prompt, and look inside the resulting firmware directory for firmware/tools.
You could even try my all-singing, all-dancing setup-reprap-host-dev-environment.sh script, instead :-)
Jonathan