best way to implement captcha for contact-us form??

[tlyczko]

I already know there's four captcha downloads.

None of them makes it clear whether any of them can or should be used for the contact-us form, which does not require a signup to use it.

Alternatively, is there any way to implement forms validation for the contact-us form??

Thank you, Tom

[yellow1912]

I believe you can even require login to use contact form in the admin panel somewhere.

[Steven300]

is there any way to implement forms validation for the contact-us form??

Take a look at the Captcha_using_ttf_gd mod. It validates the Contact form as standard, as well as a few other pages. Check my site to see.