GalGen is for Gallery Generator. It's written in Ruby and generates static HTML galleries from images and their descriptions.
Make sure you have convert command (from ImageMagick, GraphicsMagick, etc.) available and you are running sane system which does not use backslashes for paths.
gem install galgen
Or get source: [http://gitlab.com/Voker57/galgen]
See manual.
Other files here:
manual