CSS Lint has been around for years, so integration with Visual Studio is a nice option. Are you using CssCop and/or CSS Lint? If so, tell us what you think of the tools.

Whether you're building a Web or desktop application, here's a round-up of tools for building the interface with plain old HTML. Being able to work comfortably on Web-related code elements -- HTML, ...

Dreamweaver CC’s most obvious enhancement is its new CSS Designer, which provides visual aids for CSS attributes ... you now have the option of assigning them HTML classes, not just unique ...