The following are the primary web pages for each of the packages used in this book:
SQLite http://www.sqlite.org/
PHP http://www.php.net/
Perl DBI http://dbi.perl.org/
Tcl http://www.tcl.tk/
Python http://www.python.org/
For support with any of these technologies the relevant mailing list is a good place to start. Instructions on joining them can be found in the following locations: