Suggest an alternative to

recaptcha

Go wrapper for http://www.google.com/recaptcha

Why do you think that https://github.com/goadesign/goa is a good alternative to recaptcha

A URL to the alternative repo (e.g. GitHub, GitLab)

Here you can share your experience with the project you are suggesting or its comparison with recaptcha. Optional.

A valid email to send you a verification link when necessary or log in.