Passmarked - Simple, all-in-one test to check the quality of your website
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Passmarked is THE tool I've been looking for to check the quality of websites (mine & clients'). The open source list of tests makes it incredibly useful and flexible for integrating into the development workflow. It's only just been launched but there's already a tremendous amount of coverage that will only get better as more people contribute.

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The tool I wish I'd built!
Pros:Not upselling me a "quick fix" (like most "grade my site" tools)
open source = transparency
community driven weighting & docs
free
Cons:Not found any so far (only a day in!) :-)
Passmarked lies at the core of web standards; specifically at the intersection of trust, code, data and software development.
Pros:open sourced, democratised test suite
Cons:site needs to speak to a more diverse audience IRO UX and CMS