Apache Rivet is a system for creating dynamic Web content via a programming language integrated with Apache Web Server. It is designed to be fast, powerful and extensible, consume few system resources, be easy to learn, and to provide the user with a platform that can also be used for other programming tasks outside the web (GUIs, system administration tasks, text processing, database manipulation, XML, etc.). It is similar to PHP, except that it uses Tcl, and provides both HTML/Tcl pages as well as pure Tcl pages to aid the programmer in separating logic and presentation when necessary.
Rivet CGI allows Rivet applications to run as a CGI, either automatically (i.e., no modifications to the applications themselves from "mod_rivet") from Apache, as a standalone CGI under any Web server, or as a standalone HTTP server itself. It can be used to build Web applications that can be distributed and executed as a single file in either CGI or Standalone HTTP mode.