Cheetah is a template engine and code generation tool, written in Python. Web development is its principle use, but Cheetah is very flexible and is also being used to generate C++ game code, Java, sql, form emails and even Python code.
CAjax is a library for building AJAX style web applications, which consists of a javascript package for easy writing object-oriented AJAX logic in javascript, and a set of server-side packages dealing with unified communication details.
XSDB XML is to DATA as HTML is to DOCUMENT. Publish and combine data as easily as HTML format and web browsers publish and view documents. Implementations in Python, javascript, java, C#/.NET.
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Python cgi's for maintaining multiple web-based schedules. None of the heavyweight CMS systems does this cleanly and simply. This is not an off-the-shelf solution, but snippets for you to use. Programming required!
Frosttie (FROnt-end SchemaTron Text Internet Engine) takes XHTML pages and processes them with various user-definable filters such a W3C's WAI, Section 508 (US) web usability compliance, ad removal, etc. It can be used with zKnowMan.