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HTML Validator - HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla.
PiP for Mac - Always on top window preview similar to the popular windows only OnTopReplica
W3C Markup Validation Service - Validates HTML markup of web pages, one at a time.
Pennywise - Cross-platform application to open any website or media in a floating window
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.
Afloat - Create beautiful invoices in 3 clicks, without mistakes