The Rivet mailing list is the first place you should turn for help, if you haven't found the solution to your problem in the documentation. Send email to <rivet-user@tcl.apache.org>. If you have a question, idea, or comment about the Rivet code itself, please send us email at <rivet-dev@tcl.apache.org>. To subscribe to either list, post email to <rivet-list-subscribe@tcl.apache.org>.
The mailing list archives are available at http://www.apachelabs.org
There are several web sites that cover Apache and Tcl extensively.
Apache Rivet uses the Apache Bug Tracking system at http://nagoya.apache.org/bugzilla/. Here, you can report problems, or check and see if existing issues are already known and being dealt with.