Dependancies
galculator uses GTK 2 (>= 2.6) and libglade (>= 2.0).
Source
galculator-1.3.1.tar.bz2
galculator-1.3.1.tar.gz
galculator-1.3.1-cygwin.zip (A special cygwin version will only be available for version 1.3.1. Future versions will include the cygwin patches.)
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Unfortunately, CVS is currently not used and therefore out of date.