Open Source Real-Time Linux Project: source.mvista.com/linux_2_6_RT
Preemption Patches Maintained by Ingo Molnar: people.redhad.com/~mingo
LinuxTiny: www.selenic.com/linux-tiny
ARM Thumb: www.arm.com/products/CPUs/archi-thumb.html
MIPS16: www.linux-mips.org/wiki/MIPS16
User Space XIP with CramFS: tree.celinuxforum.org/CelfPubWiki/ApplicationXIP
Raw NOR Flash Kernel XIP: tree.celinuxforum.org/CelfPubWiki/KernelXIP
uClibc: www.uclinux.org
BusyBox: www.busybox.net
TinyLogin: tinylogin.busybox.net
CramFS and YAFFS: www.aleph1.co.uk/yaffs
Harald Welte's Open-E2X: www.open-ezx.org
Open Phone Stack for Motorola Mobile Phones Wiki: wiki.openezx.org