There are no watermarks in the projects created with the free Nuke versions, but some lighting functions are limited and the output can only provide HD resolution. Some nodes are also not available in Nuke non-commercial, such as the Write Geo, Ultimatt, Primatte, BlinkScript and GenerateLUT nodes, and 2D format support for .mpeg 4 and .h264 is not included. The option for Python scripting has also been restricted.
The commercial Nuke Studio version has monitor output support, 3rd party plug-in support for OFX and custom plug-ins and command line rendering – functions that you also have to do without in the free version.
However, if you would like to try out the three versions Nuke, Nuke X and Nuke Studio, the non-commercial products are an ideal solution.
You can download the free Nuke family here. The tools are compatible with Windows from version 7 with 64 bit and Mac OSX from 10.8.