About request tracker, have you tried asking Best Practical?
And what do you mean for "php or perl driver to work with paradox"?
You mean accessing paradox tables from these languages?
I do think that if you've got the need to communicate between perl/php and paradox, the simplest thing is to use mysql or similar in php/perl, and to connect to mysql via odbc from paradox; i've tried it and does function well.