Get rid of your dirty markup with the free online HTML Cleaner. Easy to compose, edit, format and minify the web code with this online tool. Convert Word, Excel to tidy HTML
CSS Lint points out problems with your CSS code. It does basic syntax checking as well as applying a set of rules to the code that look for problematic patterns or signs of inefficiency.
An interactive CSS playground and code sharing tool. Dabblet saves to Github gists and offers many conveniences for CSS editing.
A web-based interface for cleaning your dirty HTML/CSS/JS markup.