Dependancies
galculator links against GTK 3 or alternatively against GTK 2 (>= 2.6) and libglade (>= 2.0).
Source
galculator-2.1.4.tar.bz2
galculator-2.1.4.tar.gz
galculator-2.1.4.zip
Source Code Repository

galculator's code repository is hosted at github. Contributions are very welcome!

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)