Pebble is a 32-bit operating sytem for IA-32 systems. It can run MS-DOS and DPMI compatible applications and will provide advanced features such as multitasking and paging. It will be a good platform to run old MS-DOS and embedded programs.
Real-time frameworks/RTOS based on active objects & state machines
Real-time frameworks/RTOS for building responsive and modular real-time embedded software as systems of active objects (concurrent state machines). The QP family consists of QP/C, QP/C++, and QP-nano frameworks, which are all strictly quality controlled, superbly documented, and commercially licensable. The behavior of active objects (a.k.a. actors) is specified in QP by means of hierarchical state machines (UML statecharts). The frameworks support manual coding of UML state machines in C or C++ as well as automatic code generation by means of the free QM modeling tool. All QP frameworks can run on bare-metal MCUs, completely replacing a traditional RTOS. Ports and ready-to-use examples are provided for major embedded CPUs, such as ARM Cortex-M, ARM7/9, MSP430, as well as Arduino and mbed. QP/C and QP/C++ can also work with a traditional RTOS/OS, such as ThreadX, FreeRTOS, embOS, and uC/OS-II as well as Linux (POSIX), Windows.
A security intensive kernel written in Ada.
Boots into many systems and GRUB2 ones!
Super GRUB2 Disk helps you to boot into most any Operating System (OS) even if you cannot boot into it by normal means.
Turtle OS is an Unix-like OS. It aims to be open source, secure, high performing and portable.
An 8-bit retro computer (but faster and with much better graphics) which harkens back to “proper” machine code programming when you could hit the metal.
amforth is an extendible interpreter on microcontrollers
amforth is an extendable command interpreter running on AVR ATmega and TI MSP430 microcontrollers. Turnkey actions for fully autonomous operations are possible as well. The command language is close to the Forth 2012 standard.
Customize Kernel 64-Bit Operating System
An Open Source Solution usable instead of Microsoft Windows. The ck64os enables server operating system tasks but is downgradable to an End-User software distribution for Tablet-PCs. It's Microsoft Windows application programming interface compability bases on incorporated virtualization layers.
this is a cms that i created at first for my lesson internet application project i created a cms that can easily change and add template and plugin u can download in google docs here http://docs.google.com/leaf?id=0B_sqR08PSbSZZDMyZjAxNWYtZDlmMC00YjB
flos operating system
Another hobby OS.
Simple 32/64bit mode OS. Paging, handling exceptions IRQ INT, Basic: PIC/APIC, PCI, kbd, ps/2 mouse, ata. Thanks to wiki.osdev.org and (in alphabetical order): Kicer86, milyges, Nevar, webczat, Wojtulas. (IRC freenode #osdev.pl)
replicated-kernel Linux-based OS
The Popcorn Linux project is exploring how to design operating system for future multi- and many-core hardware platforms, that can be Instruction Set Architecture (ISA)-diverse, based on the Linux kernel.
uOS is a Micro Operating System designed for developers.
A native, dual-bootable ubuntu for the HTC™ HD2 Phone (qsd8250 SoC)
ubnhd2 is a security and pentest focused ubuntu/debian system that runs natively on the HTC HD2 phone. To boot this you need the Magldr on your phone and the first FAT partition should be named "SD". The wifi drivers are not included check the Ubuntu HTC HD2 Section from forum.xda-developers.com/showthread.php?t=1975081 for more details.
yaMOS stands for: yet another "My Operating System". This is a hobby Operating System, let's see to what it develops... At the moment it's only a kernel written in C++ and Assemly.