HTML Tidy is an open source program and library for checking and generating clean XHTML/HTML.

The Bluefish HTML editor is an excellent example of of how good open source programs can be. It is feature rich, with lots of time saving tools for ...

Amaya started as an HTML + CSS style sheets editor. Amaya is an open source software project hosted by W3C.

JTidy is a Java port of HTML Tidy,a HTML syntax checker and pretty printer. Like its non-Java cousin, JTidy can be used as a tool for cleaning up malformed and faulty HTML. In addition, JTidy provides a DOM interface to the document that is being processed, which effectively makes you able to use JTidy as a DOM parser for real-world HTML.