fwblocker is a script used to parse syslog files for SSH, pure-ftpd and iptables entries. It will generate statistics but it's main feature is to lock out IP addresses that used a wrong username/password to log into your SSH or FTP Server.
Nmap Log Stripper is a Bash script intended to be a way to condense all, or some, of the IPs of a "random" (-iR) nmap scan into a file for later usage.