What exactly do you mean, are you concerned about hackers infecting your website with malicious code ? If so I suspect you need to contact whatever host you're going to use and get chapter and verse on their security from the horses mouth. I'm not aware of any freebies designed monitor a websites integrity.
You should also note that if you're setting up a business website, you will immediately cease to be a non profit home user and at that point lose your eligibility for most free license software. Continue to use it and you'd be open to prosecution by FAST.