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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.
...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...
Give your IT, operations, and business teams the ability to deliver exceptional services—without the complexity.
Freshservice is an intuitive, AI-powered platform that helps IT, operations, and business teams deliver exceptional service without the usual complexity. Automate repetitive tasks, resolve issues faster, and provide seamless support across the organization. From managing incidents and assets to driving smarter decisions, Freshservice makes it easy to stay efficient and scale with confidence.
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.