From Seo Wiki - Search Engine Optimization and Programming Languages
Apache Rivet is an open source programming system that allows developers of web sites to use Tcl as a scripting language for creating dynamic web sites. Rivet is similar to PHP, ASP, and JSP. Rivet is primarily developed by Damon Courtney, David Welton, and Karl Lehenbauer.
Rivet can use any of the thousands of publicly available Tcl packages that offer countless features such as database interaction (Oracle, PostgreSQL, MySQL, etc.) or interfaces to popular applications such as the GD Graphics Library.
Notable Web Sites using Rivet