Spam Bot Blocker by Aurora Creation is a module that helps you with getting rid of those nasty bots spamming your store with mass fake registrations.
Spam Bot Blocker Plugin for Magento
The module uses a simple JS script that is invisible for bots, so they cannot pass the script and get blocked. Tired of deleting those fake accounts all the time? Tired of your store performing a lot slower because of 10000 "clients"? Our module is a solution to that!
Using your Back Office you can enable or disable the module and also set some more advanced features. Features such as setting your own registration form selector (if your theme changes the default class of registration form) and data added to the form.
We are always open for your suggestions and complaints, Please reach us.