The Foundry has released non-commercial, non-watermarked, free versions of Nuke, NukeX and Nuke Studio, aimed at anyone who wants to learn how to use the software. Nuke non-commercial comes with certain restrictions, including an output resolution limit of 1920×1080, some disabled nodes, etc. And it also places a few restrictions on the way it can be used. More on The Foundry’s website.