Gentoo Linux is a versatile and fast Linux distribution for x86, PowerPC, Sparc, and Sparc64 that's geared towards Linux power users. Unlike other distros, it has an advanced package management system called Portage. Portage is a true ports system in the tradition of BSD ports, but is Python-based and sports a number of advanced features including dependencies, fine-grained package management, "fake" (OpenBSD-style) installs, path sandboxing, safe unmerging, system profiles, virtual packages, config file management, and more.
TINY is a small Linux distribution designed especially for reusing old computers. It has very low demands in terms of hardware capacity, and even a Linux beginner can install it easily. No CD driver is required for installation, even for standalone machines. TINY is GUI capable . As long as your machine can bear it, you can run all available Linux applications on it.
Coyote Linux is a mini distribution designed for setting up network utility services such as Internet connection sharing, firewalling, or wireless access points. The goal is to make it as quick and easy as possible to set up a Linux system with only a minimal amount of Linux knowledge.
kdb is a debugger that is part of the linux kernel and provides a means of examining kernel memory and data structures while the system is operational. Additional commands may be easily added to format and display essential system data structures given an identifier or address of the data structure. The current command set allows complete control of kernel operations including single-stepping a processor, stopping upon execution of a specific instruction, stopping upon access (or modification) of a specific virtual memory location, stopping upon access to a register in the input-output address space, stack tracebacks for the current active task as well as for all other tasks (by process id), instruction disassembly, et. al.
ROCK Linux is a distribution build kit for creating Linux distributions. You can easily design and build your own distribution by choosing packages, compilers, and optimization options, and optionally enable the GCC Stack-Smashing Protector for enhanced security. It is also possible to choose custom configure options, cross-compile, and much more. Many specialized targets (customized distributions) have already been created, such as a Desktop, Router, or Minimal distribution. A variety of architectures are supported.
Briefly, FreeBSD is a UNIX operating system based on U.C. Berkeley's 4.4BSD-lite release for the i386 platform (and recently the alpha platform). It is also based indirectly on William Jolitz's port of U.C. Berkeley's Net/2 to the i386, known as 386BSD, though very little of the 386BSD code remains. A fuller description of what FreeBSD is and how it can work for you may be found on the FreeBSD home page.