I did a search and it seems that there are no posts about LightZone: http://lightzoneproject.org/. LightZone is a free program very similar to Lightroom and Capture One and I've been playing with it on and off for a while. There's a bit of a learning curve if you've been using Lightroom for some time, but it's not difficult to get a handle on how it works. The results can be very good indeed and it's quite a powerful program, even though it is still in development. For anyone that hasn't got any of the commercial products, I highly recommend registering and getting this software.