Checky is a document validation and analysis extension for Firefox, Mozilla, and Netscape. It provides an easy-to-use interface to many free and commercial online validation and analysis services. It allows the user to validate, analyze, view, and inspect documents containing HTML, XHTML, CSS, RDF, RSS, XML, P3P, hyperlinks, metadata, and many more. It can check Section 508 and WAI compliance of documents with many helpful services. It can help in the design, development, and maintenance of accessible documents for a semantic web.
Pike ScriptRunner allows you to run scripts written in Pike under any FastCGI-enabled Web server. It provides request parsing and I/O handling, enabling you to get right to the task of writing your code. It is a dynamic object-oriented language with a C-like syntax and a number of features that make it desirable for rapid prototyping and deployment of Web applications.