I wrote this as a test while writing a weight tool (that I haven't finished yet), but the test GUI turned out to be somewhat usable as it is, so I'm releasing it.
The goal: I wanted to have something like the Maya Weight Painting tool (but without using a painting tool) to have more control of where a deformer weights are spread.
It is a simple ICE compound that colorize the object according to it's weights, the more weight it has, the warmer the color. One thing I like about it is that even if the weight is 0.0001 the point will be blue, so it will be easy to spot.
It's not a Plugin or addon, but a simple script file. Create a button, drag it to your Script Editor or whatever and run it.
You'll need to specify the xsicompound path in the PPG, or you can edit the .py file (The third line is the xsicompound path, and is very easy to edit, just write your own local path)