[WSG] Open source Relevant CSS tab?

[Tim]

I'm wondering if there's an online or open source tool that provides the 
functionality of DMX2004's Relevant CSS Tab feature. I hand-code my 
pages, but I've tried this feature and although I found it very useful, 
I don't think it's $400-useful. I'm sure most on this list are familiar 
with this feature, but for those who don't use DMX, it basically 
provides all the relevant CSS that affects any given element, based on 
where you put the cursor within the code view of the markup. AFAIK, no 
other tool has this feature (correct me if I'm wrong).

I found this particularly useful when troubleshooting bugs.

Thanks,
Tim
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