Render[in] : Radiosity rendering for SketchUp

Render[in] is currently in beta-testing till the end of December 2010 and during that time, you can freely request a serial number to test it. It works on Windows and OSX.

Specifics:

• fully integrated (using native SketchUp features)
• radiosity in real-time (!)
• additional control
• advanced material settings
• sky & clouds & environment
• artificial light

Info on http://www.renderin.com