Simul Software have announced the beta version of CloudWright 1.6, the skybox generation tool. CloudWright is a tool for making skyboxes - using physical calculations of sky colour and light scattering in clouds. Exported formats include jpg, hdr and dds cubemaps. The exported images can be used for any purpose without license restrictions. The unregistered version has full functionality, the only difference is it doesn't export images. Major new features in this version include interactive raytraced preview images. Image size is now up to 2048x2048 in high or low dynamic range.
It can be downloaded from http://www.simul.co.uk/cloudwright/download.