While not exactly what you asked for maybe, http://www.netfirms.com/ used to, and probably still provides free perl cgi-bin access (with banner ads, of course). Most things can be programmed to return the result to a browser, and with CGI::Carp, the errors too, even if it isn't really a CGI program.

Only ftp access though, or at least it used ot be. Maybe it is still better than nothing?