pyHIDS is a simple HIDS (host-based intrusion detection system) for verifying the integrity of a system. It uses an RSA signature to check the integrity of its database. Alerts are written in the logs of the system and can be sent via email to a list of users. You can define rules to specify files to be checked periodically.
You can download it from the following link: https://packetstormsecurity.com/files/download/120617/cedricbonhomme-pyhids-fd1cfb816ed0.tar.gz
Source: https://packetstormsecurity.com/files/120617/pyHIDS-0.2.html