rc.firewall is configurable for dialup and static IP addresses. It is based on Linux-kernel 2.4.x, and it generates it's own configuration file. It supports specific port filtering for the internet- , intranet-, and a dmz-zone. For the DMZ-Zone, there is also a machine-specific port filtering, and redirection of specific ports of the internet-interface available. Note: Do not install this in productive environments, until you have checked the rules/tables with your own eyes.
serverizor allows you to take a normal command- based program, and run it as a tcp server in the background. This means that you can start up such programs once, and then connect to them with a command-line client, and run commands, disconnect, connect again from some other machine, etc. So, you can use it to boot up a large program such as emacs or lisp (in interpretor mode, not in editor/windowing mode) in the background, and then whenever you want to run emacs/lispy scripts, you could just run a serverizor client with a few commands. Therefore, the client and the server are the same program.