having searched all over the place for a contact form which used a numeric captcha form, I was beginning to think I had to give up. And then I tried this component.
It is a very nice on, with a lot of features, nice layout and the ability to customise in almost every respect.
However it didn't generate numeric captchas. After the exchange of a couple emails, Alexandru Dobrin, the developer, enabled it to do this, by exchanging the text file for a numric one. Using a random generator site, I created a list of 500 random numbers which I put into the word lists, saved each one with the apropriate ISO name - eg - ar.txt for Arabic and ru.txt for Russian and that now provides a purely numeric captcha that can be used with any keyboard which also has 0-9 on it.
So, not only a great component, but great support and help from the developer. Fantastic!