Akismet if I want to continue using the native Wordpress commenting. For really legit sites that do get alot of discussion I also swap over to Facebook comments. Not only great against spam but credibility is much higher for readers imo
Install Akismet plugin, get a Akismet API key and set it up. Then install Jetpack plugin and enable comments, user then can use Wordpress account (Gravatar) or FB.
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