Google's reCAPTCHA is great for getting rid of those pesky bots spamming your contact forms. Implementing reCAPTCHA on your site is very easy, albeit somewhat confusing if you try to follow official documentation. Below example assumes you're using NodeJS with ExpressJS for back-end and Pug (formerly Jade) templating engine on the front-end. General principle is the same regardless of languages... Read more »