pks-commands.php3 allows your Web server to search and add PGP/GPG keys from the public keys out there. It takes the TCP 11371 port connection and does it all on the web server. It is good in environments where the client machines are unable to get to arbitrary TCP ports (such as behind tightened firewalls).
Rubyforger is a raw packet manipulation tool. It allows you to easily send, receive, and modify Ethernet, ARP, IP, TCP, UDP, and ICMP packets. Creating and modifying packets is easily done by adding layers and changing their parameters. Visualforge is a GUI packet crafter based on Rubyforger create, send, and receive packets and export the Ruby code in just a few clicks.
UDSC is a system updating and security hardening tool with support for VPS servers. It disables SSH protocol 1 and moves the sshd port to 1322. It can install or remove APF Firewall. sysctl is hardened with a commonly used and tested sysctl.conf. Notification of root logins is provided via off-site email. logwatch is set up with nightly email messages. RKHunter is installed, and a cron job set up. Dangerous files are chowned to only root. iftop is installed (from source).