Firewall Log Daemon is a program written in C which will watch for ipchains or iptables log alerts in realtime. The program will start a small daemon process that parses and resolves firewall logs by reading a FIFO that syslog writes to. It can queue a batch of alerts and mail them to you, or can be used in a script to crunch an existing log file or data stream. It features hostname, port, protocol, and ICMP type/code lookup, with output formatted by a user-defined template.
Eznet makes setting up PPP for Linux easy. Just enter the name of your ISP, a phone number to dial, the login name, the password and the TTY and eznet takes care of the rest. There are no chat scripts to write, nor any pppd configuration files to fuss over. Eznet handles multiple ISPs and can dialup any of them with a single simple command. It also supports dial-on-demand using either kerneld or diald.
The Falcon Project (Free Application-Level CONnection kit) is an open firewall project with the intention of developing a free, secure and OS-independent firewall system. Falcon consists of three major modules: Falcons's own proxies (written in Perl); 3rd-party proxies (squid / qmail / BIND8), each modified for chroot environment; and general concepts for OS hardening, chrooting etc.