An operating system based on the best Windows NT design principles
ReactOS is an open source effort to develop a quality operating system that is compatible with applications and drivers written for the Microsoft Windows NT family of operating systems (NT4, 2000, XP, 2003).
FreeOS/1 is a Free, Open Source, FreeDOS based Free and Open Source Alternative OS, with open source Microsoft Windows compatibility using HXDOSExtender KernelEx,and ReactOS source code. FreeOS/1 will include new technologies and will be easy to use
64-BIt Operating System with Compiler
TempleOS is a 64-bit kernel with compiler, graphics library and tools. It is not a Unix. It was made from scratch.
Perix is a 16/32 protected mode kernel, bootable and capable of running without an operating system. It is written in Turbo Pascal 7.0 for DOS, Delphi 7.0, Pascal Pro, Virtual Pascal v2.1, TASM and JWASM. Turbo pascal version can be used as kernel on its own, or as a second stage loader to external programs. I would like to announce, that the first attempt to put the Delphi 64bit to work was successful. As soon as possible I will place at the disposal a very small 64bit kernel version.
The Danber project aims to create an operating system where both Windows and Linux programs can be run: it is a Windows NT based kernel, but with UNIX user mode compatibility. Support for both PE and ELF executable formats.
A techonogically advanced engine using C++ and ASM as languages.
A techonogically advanced engine using C++ and ASM as languages, with improved performance and a almost virtually infinite triangle count support, even on slower and older machines. It haves a full shader system, physics system (DOE Based), 100% physically correct lightning and colour grading, and supports various popular formats in 3D modelling and gaming scene. It was previously under a heavy eula policy, but now is under GPL because of internal problems.
FreeMiNT is a free alternative OS kernel for Atari systems & clones
FreeMiNT provides the basis of a free TOS compatible replacement OS that can multitask. Used together with the free system components fVDI (device drivers), XaAES (graphical user interface widgets), and TeraDesk (desktop manager), it provides a modern user interface.
The Isis OS Project Is a Controlled Project to Develop An Advanced Modern Operating System!
Lamp is a Unix-like environment that runs in a single process (via threads) on traditional Mac OS, including standard I/O, vfork/exec, a shell, perl, sockets, virtual fs with /dev and /proc, signals, and ptrace(). Runs on 68K/PPC, and on OS X as Carbon.
An Unix kernel. Will have support to Win32 and Mac.
Perix is a free public domain MS-DOS compatible operating system written in Turbo Pascal and Assembly. Multi tasking, parallel data transfer and extended memory support. All parts of system are distributed under terms of the GNU license.
Sinhala Desktop is a Sinhala Version of Windows Shell Replacement. This project contains all the major Windows System components with Sinhala User Interface. (Sinhala is a national language of Sri Lanka.) Developed Using Delphi 6 and C++Builder 6.
Nth Generation Linux Environment
Nth Generation Networking environment with new low level features, minimal size, new application model, integration models, new futuristic ideas.
xhelper is a scripting tool (batch processor) for the desktop. It can move windows, resize windows, activate windows, send keys to windows, run programs, and more.