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W3C Markup Validation Service - Validates HTML markup of web pages, one at a time.
Stylebot - Change the appearance of websites instantly. Preview and install styles created by other users on stylebot.me
HTML Validator - HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla.
FreeStylerWs - Styles and skins for all popular sites in the web
Rocket Validator - Site-wide Accessibility and HTML validation made easy. With a single click, Rocket Validator will check thousands of web pages on your site for Accessibility and HTML conformance, producing a detailed, actionable report on seconds.
Stylem - A user style manager for Pale Moon, Basilisk, Interlink, SeaMonkey, and other Mozilla-based software. Install styles from userstyles.org to change how web pages and the application look.