Lightzone was first launched in 2005 as commercial software, though the company behind the application stopped the development of the software in 2011. In 2013, the software was released under a BSD open-source license, though this latest version is essentially the last version that was available in 2011, though with updated RAW profiles to support many digital cameras that have been released since then.
However, despite this two-year hiatus in development, Lightzone still offers a very strong feature set for photographers looking for an alternative tool to Lightroom for converting their RAW files. There are downloads available for Windows, OS X, and Linux, though I've just looked at the Windows version, using a rather average laptop.
Over the next few pages, I'll take a closer look at this interesting application and share some thoughts that should help you to decide if Lightzone is worth considering as part of your photo processing toolkit.