Embedded Linux contributions to the Linux Ecology HOWTO.
In particular, Free Electrons took advantage of its experience with embedded Linux system development to add new techniques which can reduce power consumption or make it possible to extend the lifetime of old systems with limited resources.
More details can be found on this LinuxDevices.com article.
Free Electrons also contributed an overview presentation on this HOWTO. The latest HOWTO version with our updates (waiting for the next official release) can also be found on the same page.