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ChibiOS/RT is a free and efficient RTOS designed for deeply embedded applications. It offers a comprehensive set of kernel primitives and supports many architectures: ARM7, Cortex-M0, Cortex-M3, Cortex-M4, PowerPC e200z, STM8, AVR, MSP430, ColdFire, H8S, x86.
This is one of the most popular Doom source ports. It is available for DOS, Windows, Linux and Mac OS X, and should build on any POSIX platform which supports SDL. It enhances Doom with things like TCP/IP networking, OpenGL renderer, Heretic support and much more.
PacMan2 - The Family - Network Edition - Arcade game - opensourceware version of Pacman with NEW DESIGN and LOTS OF DEVICES (program's engine has got script executer - Squirrel(R)), in 2D version, semi-3D version and under development fully 3D
It can be played by 2 players at the same PC or in multiplayer mode
over the LAN-network (TCP/IP protocol, uses sockets)
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...I've managed to get the older versions of the software tools running on Windows, so that there is no major invasive source changes, outside of either broken drivers, or massaging the makefiles to find things in the new paths, and calling the appropriate tools where needed.
Linux 0.10 is the first oldest version of Linux that is somewhat usable. While it lacks things like TCP/IP, and robust filesystems, it does offer a small kernel size, perfect for playing around with. You can comfortably make changes on Windows, re-compile and test all from a 'normal' desktop.
A microkernel-based multiserver operating system written from scratch.
HelenOS is a portable microkernel-based multiserver operating system written from scratch. It decomposes key operating system functionality such as file systems, networking, device drivers and graphical user interface into a collection of fine-grained user space components that interact with each other via message passing. A failure or crash of one component does not directly harm others. HelenOS is therefore flexible, modular, extensible, fault tolerant and easy to understand.
HelenOS...
The FNET is a free, open source, dual TCP/IPv4 and IPv6 Stack (under Apache Version 2.0 license) for building embedded communication software on 32bit MCUs.
A shareware game called begin was released in 1984: a tactical starship game with a good AI and fair rules (the computer had no advantage) I've hacked assembly code to make it a multiplayer game, so that folk can challenge each other rather than the AI.
The netboot project allows booting a diskless PC over a TCP/IP based
network using standard protocols like BOOTP, DHCP and TFTP. It is
able to boot Linux, FreeBSD, multiple DOS variants (including MS-DOS, PC-DOS,
PTS-DOS, OpenDOS, NovellDOS, FreeDOS)
LUnix (little UNIX) is an operating system for the Commodore64 - a famous home computer back in the 80s. It supports TCP/IP networking (SLIP or PPP using a RS232 interface). LUnix aims to look and feel like UNIX.
We intend to provide a development system for the Rabbit2000/3000
microcontrollers.
On Linux: a cross C-compiler, assembler, linker chain.
On the rabbit: a BIOS including download and debugging
facilities. Later a realtime kernel + TCP/IP stack
We are currently developing our embedded TCP/IP modules, industrial ethernet systems and wireless platform for system control and data acquisition. Our main development environment is Linux and GNU tools like GCC (ASM, C, C++) and Python.
Liquorice is a multithreaded SASOS for use in embedded systems (8 bit and up). Includes a small but working IP/ARP/ICMP/UDP/TCP stack with SLIP, PPP and Ethernet support.