Dependancies
galculator uses GTK 2 (>= 2.6) and libglade (>= 2.0).
Source
galculator-1.3.4.tar.bz2
galculator-1.3.4.tar.gz
galculator-1.3.4.zip
Binaries
Various distributions (Debian, Ubuntu, Fedora, ...) include galculator in one or another form.
The cygwin-ports project maintains cygwin executables of galculator.
RPM packages
spec - a spec file is included.
Redhat/Fedora - packages for RedHat/Fedora are available at http://dag.wieers.com/packages/galculator (see also apt-get)
Patches
Any patches are made available through sourceforge's patches system.
CVS

Unfortunately, CVS is currently not used and therefore out of date.