Downloading GNUstepView a list of packages you need for GNUstep
GNUstep Source code can be easily obtained from either the main FTP site or several mirrors around the world.
GNUstep has a Project Page where you can get source information, access to the CVS source via the web and Anonymous CVS access.
Current snapshots are available at:
Beware that some users have experienced problems with corrupt files download from ftp.gnustep.org. This may be due to a problem with your particular route to the machine. If you have this problem try using a mirror site or download using the http interface.
FreeBSD users can use the ports directory to install GNUstep:
cd /usr/ports/devel/gnustep; make; make installas root
There are also debian packages available. I assume they are in some normal debian location. Ask if you can't find them.