I have also found R to be quite powerful, although a bit cryptic at times to use. The qcc package is very useful for generating run charts automatically from captured data.

Calling R from perl is possible using the R/Splus-Perl Interface. I have not used this interface, and it is dated now but reported to work well.

Another option is CGI access to R.

I could not tell from your post if you live in a *nix environment, but your mileage may vary if the above options are attempted while using other forms of operating systems.