20. Tcl

The Tcl Apache project integrates Tcl with the Apache webserver. Tcl is a lightweight, extensible scripting language. You can learn more about Tcl here. There are several modules currently under the Apache Tcl umbrella:

• Mod_dtcl allows for embedding Tcl on HTML pages like PHP does.
• Neowebscript takes a similar approach
• Mod_tcl takes an approach similar to mod_perl and runs both in 1.3.x and 2.x versions of Apache.