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 
- calendar - a package providing a simple configurable calendar generator