you forgot to mention:
Risc OS Open -
http://www.riscosopen.org/content/
Bare Metal OS -
http://www.returninfinity.com/baremetal.html (Link seams broken ATM) (Written in ASM if I recall corectly)
AuroraUX Project -
http://www.auroraux.org/index.php/Main_Page - OS based on DragonflyBSD. The core of the project and its utilities are written in Ada
HelenOs -
http://www.helenos.org/ (Screens here:
http://trac.helenos.org/wiki/Screenshots, ) BTW, some nice docs from HelenOs:
http://trac.helenos.org/wiki/DeveloperDocs
BeTROS -
http://www.bertos.org/
FreeDOS for gods sake -
http://www.freedos.org/
KolibriOS
http://www.kolibrios.org/
Minix - I can't believe it wasn't mentioned -
http://www.minix3.org/ (Last I've heard EU was to invest in developing Minix as stable and secure OS, mostly because of it's kernel)
PureDarwin -
http://www.puredarwin.org/
SkyOs -
http://www.skyos.org/?q=node (Probably proprietary)
Multics (Source Available) -
http://www.multicians.org/
BTW, MenuetOS jumpet to pretty shitty license
Quote:
Menuet64 Copyright (c) 2005-2011 Ville Turjanmaa
1) Free for personal and educational use.
2) Contact menuetos.net for commercial use.
3) Redistribution, reverse engineering, disassembly or decompilation
prohibited without permission from the copyright holders.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, AND
CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL VILLE TURJANMAA OR ANY AUTHORS OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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