Shrimp renderman
I accidentally put my hand on the source code of Shrimp a Shader Editor for renderman (Prman ,3Delight,Acqsis,Air,Pixie).
I started to add some GUI stuff to make it more appealing and user friendly (like curve connection between blocks ,copy paste,cut edit, marquee selection of block,file dialog for texture…..).
The Alpha it’s available check it : http://shrimp.sourceforge.net/