Libreboot is a free BIOS or UEFI replacement (free as in freedom); libre boot firmware that initializes the hardware and starts a bootloader for your operating system. It's also an open source BIOS, but open source fails to promote freedom; please call libreboot free software. Learn more
Many people use non-free firmware, even if they use GNU/Linux. Libreboot joins GNU in building a world where everyone can use, study, adapt and share software, with true control and ownership over their technology.
Laptops and servers with libreboot and GNU/Linux preinstalled are also available.
These systems come with libreboot and GNU/Linux preinstalled, where everything works out of the box. This is useful, for those who do not want to install the software on their own, but still want to use it. These systems are fully endorsed by the Free Software Foundation, under their Respects your Freedom certification.