Best plugin for stop spammers I used!

I used Stop Spammers on 3 of my WordPress websites and I find it to be very effective in stopping these annoying spam entries into the registration, comment forms or more. The plugin has a lot of options that can be customized by your preference, special situation and level of false positive you’re comfortable with. Specifically, I like the option to allow the actual users who get blocked to fill out a form to get whitelisted. I recommend this plugin warmly to everyone looking to protect their website! Thanks — Lucian