Lazarus is a free guestbook script written in PHP that uses your MySQL database for storage and is based upon the excellent Advanced Guestbook script from Proxy2.
I took the Advanced Guestbook and added more features and several layers of anti spam protection to make one of the most feature rich and spam resistant guestbook scripts ailable for free.
I am always active on the forums and you can rest assured that if the spammers find a way past the current anti spam methods that I he others waiting in the wings. You can read my own guestbook to see what other people he had to say about Lazarus and my anti spam fixes for Advanced Guestbook.