ConnochaetOS

ConnochaetOS is a Libre GNU/Linux distribution for old computers, starting from a computer with a 586 processor, 64 MB RAM, and a 2 GB HD drive. It includes a full-featured WebKit-based Web browser, an email client, multimedia software, and office programs
http://www.connochaetos.org/

FAI - Fully Automatic Installation

FAI is a non-interactive system to install, customize and manage Linux systems and software configurations on computers as well as virtual machines and chroot environments, from small networks to large-scale infrastructures and clusters.
http://fai-project.org/

Hosting Controlpanel Kloxo.

Kloxo is a lightweight and powerful Web hosting panel that has been in development since 2002. It was formerly known as LxAdmin. It allows for adding customers, resellers, and wholesale resellers with few clicks. Clustering functions are also built in, so you can expand and add servers whenever you need. 
http://www.lxcenter.org/

Coreboot

coreboot (formerly known as LinuxBIOS) is a Free Software project aimed at replacing the proprietary BIOS (firmware) you can find in most of today's computers. It performs just a little bit of hardware initialization and then executes what is called a payload.
http://www.coreboot.org/Welcome_to_coreboot

GNU libmicrohttpd

GNU libmicrohttpd is a small C library that is supposed to make it easy to run an HTTP server as part of another application.
http://www.gnu.org/software/libmicrohttpd/

Cottage

Cottage is a simple graphics and sound engine implemented on top of HTML 5's canvas and audio elements. It aims to be an easy to use library for Web-based game development.
http://anemonesoft.com/os/cottage/index.html

Very Simple Control Protocol & Friends 0.3...

The very simple control protocol is a protocol for M2M (machine to machine), home automation, and similar things. This package includes programming tools, daemons, and userspace tools for using this protocol.
http://www.vscp.org/