Today I discovered this little util:
https://github.com/krasimir/deb.js
It's really tiny but has a lot of potential.
Basically from this I played a bit with the Function.prototype to build a lame tracing module:
http://jsfiddle.net/AlexCode/39p6wmLa/
I'm sure there are more of these little tools around so, what do you use? Why? :)
Expert Comment
I'll checkout that tool, but what do you use?