Excellent plugin and support

I have been using the free version of WordFence on two different web sites for about a year now–since one of my sites was hacked. It has protected me from a number of attempts to login as administrator. The plugin reviews my sites once a day not only for malicious links but it compares the actual code of the different themes and plugins I am using with the current versions on WordPress, notifies me of any issue, and shows me exactly how my file and the reference file differ. I regularly also get an informative newsletter that discusses issues discovered within WordPress plugins. It is also regularly updated with new features. Highly recommended.