Free singe software for linux

Diet-Router provides a singe floppy DSL router.
Diet-Router is a Linux router that is small enough to fit on a single floppy disk. It focuses more on security than on functionality.
Diet-Router is a Linux router built with the dietlibc. It is small enough to fit on a single floppy disk. You may think that there are several other Linux routers, which come with more features and you are right. I build this router package more with the view on security than of functionality. So this project differs a lot from most other router or mini-Linux projects.
Main features:
- I use a 2.4.x kernel to have the great features of net-filter.
- I patch some net-filter extensions to have even more filter functions.
- I harden the kernel with the grsecurity kernel patch.
- Kernel modules are disabled.
- By default root login is disabled - even on the console.
How does it work:
First of all, all programs are linked statically. This is the main idea of this system. No libraries are needed. It uses busybox and tinylogin, two typical multi-call-binaries for small systems. The iptables, iptables-restore and iptables-save commands have been made a multi-call binary by me. The pppd and pppoe programs have only been patched to compile with the dietlibc. The minit and od_syslog are really small programs, from people with much more knowledge of programming than me. So, special thanks to Felix von Leitner, Olaf Drefs and all the dietlibc/libowfat programmers.
Enhancements:
- Updated dietlibc, libowfat, dropbear, ppp, kernel and grsecurity to recent
- versions.
- Added new packages dhcp server (udhcpd) and vi (e3).
- The build system has been completely rewritten and documented.
- It supports multiple downloads, a simple interface for package building/setup and target file descriptions including file owner and permissions.
- Some simple checks for build requirements are implementet.
- The setup is now able to configure mutiple network interfaces and also mproxy, udhcpd and dnscache can be configured for eachnetwork interface.
- All packages have at least two internet sources.
- Support for disc based target systems has been added.