C3D Render Buddy
C3D Render Buddy is a utility for Cheetah 3D users that lets them quickly view and manipulate their render history (and I keep promising to add other functionality to it).
This is a port to node-webkit of a utility originally written in Realbasic (now Xojo).
You may find this interesting as an example of an application written using node-webkit, although it will only be useful on Mac OS X if you use Cheetah 3D (otherwise the relevant files won't be there).
If you just want to download a working application, you get get it here.