eCOS:

wget http://mirrors.kernel.org/sources.redhat.com/ecos/ecos-install.tcl

sh   ecos-install.tcl

FreeRTOS:

wget http://sourceforge.net/projects/freertos/files/latest

RT-Kernel

http://www.rt-thread.org/

RTEMS

Build Tools:

 http://www.rtems.org/wiki/index.php/RTEMS_Source_Builder

sudo apt-get install binutils gcc g++ gdb unzip git python2.7-dev

sudo apt-get install cvs

sudo apt-get install texinfo

cd ${HOME}

mkdir -p rtems/src

cd rtems/src

git clone git://git.rtems.org/rtems-source-builder.git

cd rtems-source-builder

source-builder/sb-check

cd rtems

../source-builder/sb-set-builder --list-bsets

../source-builder/sb-set-builder --log=l-arm.txt --prefix=$HOME/rtems/4.11 4.11/rtems-arm

ls $HOME/rtems/4.11

ls $HOME/rtems/4.11/bn

export PATH=$HOME/rtems/4.11/bin:$PATH

ftp://ftp.rtems.com/pub/rtems/

uCOS

http://micrium.com/