Kernel: http://www.kernel.org/
LSB （Linux Standard Base）: http://www.linuxbase.org/
ELC（Embedded Linux Consortium): http://www.embedded-linux.org/
OSDL（Open Source Development Labs）: http://www.osdl.org/
CELF（Consumer Electronics Linux Forum): http://www.celinuxforum.org/
LFS(linux from scratch): http://www.linuxfromscratch.org