PhoneNumbers is a project mainly written in JAVASCRIPT and PHP, it's free.
grep command to find phone numbers in html files
Run the below command in terminal to find phone numbers. Should be tweaked further to ignore images with names similar to phone numbers.
grep -o '(([0-9]{3})|[0-9]{3})[ -]\?[0-9]{3}[ -]\?[0-9]{4}' *.html