Lilblue Linux is a Gentoo-based, security-enhanced, fully featured XFCE4 desktop system for amd64, built on uClibc. Its userland utilities are not provided by busybox, but by coreutils, util-Linux, etc. It resembles a common Linux system with one exception: It uses uClibc as its standard C library and not the more common glibc, and so brings in some of the advantages of embedded systems. Security enhancements come from Gentoo's hardened toolchain and Grsec/PaX-patched kernel. The fully-featured XFCE4 desktop has software for browsing, email, word processing, multimedia, chat, games, and more.
IBM PS/2 Model 57 Linux is a small Linux distribution for the IBM PS/2 Model 57 (or any other 32-bit x86 PC). It can run fine even on a FPU-less 80386 with 4 megabytes of RAM. It is based on a Linux 2.4 kernel and uClibc. It is mostly meant as an install disk that installs a system on which you have to compile your own software. Providing the standard library shared files or compiling binaries statically is your own responsibility. This avoids the hassle of getting something to run. Installation is done with a simple installer and the installation media is just two floppy disks.
OpenBricks is an enterprise-grade embedded Linux framework that provides easy creation of custom distributions for industrial embedded devices. It features a complete embedded development kit for rapid deployment on x86, ARM, PowerPC, and MIPS systems with support for industry leaders. It is meant for individuals and companies that are looking for rapid board bring-up with fine-grain embedded Linux distribution setup with complete customization. It eliminates the need to care about BSP and toolchain.