If you are running Gentoo, heard about the release of the LightZone source code and got curious to see it for yourself:

# layman -a betagarden
# emerge -av media-gfx/LightZone

What you get is LightZone 100% built from sources, no more shipped .jar files included. One word of warning: the software has not seen much testing in this form, yet. So if your pictures mean a lot you, make backups before. Better safe than sorry.