In addition to the core Apache module, Rivet provides a number
      of Tcl packages that include potentially useful code.
    
- commserver is a package providing a server that can be
	used for IPC.  Still experimental.  Requires the comm package
	from tcllib. 
- dio is a database abstraction layer. 
- dtcl is a compatibility package for mod_dtcl
	applications. 
- form - for creating forms. 
- rivet - some additional, useful routines. 
- tclrivet