Fully interactive 3ds Max rendrerer plugin which reacts to user modeling activity in 3ds Max while the image is rendered.
Fully interactive Cinema 4D renderer plugin which reacts to user modeling activity in Cinema 4D while the image is rendered.
Interactive mode in 3ds Max and Cinema supports reaction to mesh edits, objects motion, shading, lighting and camera motion of course.
2-10x faster rendering, less noise for GI, mesh lights since CentiLeo 0.580.
Node-based material/shaders GUI support in Cinema R21.
Limitations
Windows, 3ds Max and Cinema 4D only.
NVIDIA only GPUs with compute capability 3.0 and higher and at least 3 GBs of device memory (however GPUs with 2GB may also work). The list of NVIDIA GPUs and their compute capability is available here.
TODO list
Support interactive ForestPack / RailClone and MultiScatter