The Objex Project (like the GNU Project) aims to develop a complete operating system composed of free and open source software. In contrast to the GNU Project, it aims to build a modern system that brings together all the recent advances in computer science, instead of a Unix-like system. "A complete system" means that it will include the kernel, a full suite of developers tools, user utilities, and a graphical user interface. It is based on OSKit, a framework and a set of utilities, drivers, and program code intended for operating system creation.
PaulOS is a reference implementation of an embedded operating system which supports a subset of POSIX geared for embedded realtime single process applications. It is written to allow applications to be developed under GNU/Linux or FreeBSD and then recompiled without changes for the target architecture. It features POSIX file descriptors, a TCP stack (LwIP) with a BSD socket API, an ANSI C library, a DNS resolver library, and a minimal pthread library. A number of GNU/Linux network applications have been ported to it.
slakbootEBS is a software development kit for the automated creation of bootable embedded systems based on Slackware and Busybox. The focus is on i486 and ARM systems that use compact flash devices (handhelds and PC104 type boards). The distribution consists of a primary archive with tools, scripts, and documentation, and additional archives for the i486 and PXA250 binary components.