In December 2010, I bought LightZone from Light Crafts to use as my principle RAW processing photo editor (and to potentially teach to clients) and had been working with it until learning of its demise in the autumn of 2011. When routinely checking to see if the long-awaited version 4 was available, the program returned an error, so I headed to the Light Crafts website; it was gone - nothing.
A little searching revealed that the main man behind Light Crafts now works for Apple. Whatever.
Later, I discovered LightZombie.org - a support network for bereft LightZone users. Perhaps it will become a proper open-source project one day? But I'd waited nearly a year for V4, and I wasn't going to wait any longer.
I needed to look for a replacement ....