Dependancies
galculator links against GTK 3 or alternatively against GTK 2 (>= 2.6) and libglade (>= 2.0).
Source
galculator-2.1.2.tar.bz2
galculator-2.1.2.tar.gz
galculator-2.1.2.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.
SVN

galculator's SVN repository is hosted at sourceforge.net. See this page for detailed information on how to check out the source code from the repository.